Non-pharmaceutical public health interventions for pandemic influenza: an evaluation of the evidence base
© Aledort et al; licensee BioMed Central Ltd. 2007
Received: 04 January 2007
Accepted: 15 August 2007
Published: 15 August 2007
In an influenza pandemic, the benefit of vaccines and antiviral medications will be constrained by limitations on supplies and effectiveness. Non-pharmaceutical public health interventions will therefore be vital in curtailing disease spread. However, the most comprehensive assessments of the literature to date recognize the generally poor quality of evidence on which to base non-pharmaceutical pandemic planning decisions. In light of the need to prepare for a possible pandemic despite concerns about the poor quality of the literature, combining available evidence with expert opinion about the relative merits of non-pharmaceutical interventions for pandemic influenza may lead to a more informed and widely accepted set of recommendations. We evaluated the evidence base for non-pharmaceutical public health interventions. Then, based on the collective evidence, we identified a set of recommendations for and against interventions that are specific to both the setting in which an intervention may be used and the pandemic phase, and which can be used by policymakers to prepare for a pandemic until scientific evidence can definitively respond to planners' needs.
Building on reviews of past pandemics and recent historical inquiries, we evaluated the relative merits of non-pharmaceutical interventions by combining available evidence from the literature with qualitative and quantitative expert opinion. Specifically, we reviewed the recent scientific literature regarding the prevention of human-to-human transmission of pandemic influenza, convened a meeting of experts from multiple disciplines, and elicited expert recommendation about the use of non-pharmaceutical public health interventions in a variety of settings (healthcare facilities; community-based institutions; private households) and pandemic phases (no pandemic; no US pandemic; early localized US pandemic; advanced US pandemic).
The literature contained a dearth of evidence on the efficacy or effectiveness of most non-pharmaceutical interventions for influenza. In an effort to inform decision-making in the absence of strong scientific evidence, the experts ultimately endorsed hand hygiene and respiratory etiquette, surveillance and case reporting, and rapid viral diagnosis in all settings and during all pandemic phases. They also encouraged patient and provider use of masks and other personal protective equipment as well as voluntary self-isolation of patients during all pandemic phases. Other non-pharmaceutical interventions including mask-use and other personal protective equipment for the general public, school and workplace closures early in an epidemic, and mandatory travel restrictions were rejected as likely to be ineffective, infeasible, or unacceptable to the public.
The demand for scientific evidence on non-pharmaceutical public health interventions for influenza is pervasive, and present policy recommendations must rely heavily on expert judgment. In the absence of a definitive science base, our assessment of the evidence identified areas for further investigation as well as non-pharmaceutical public health interventions that experts believe are likely to be beneficial, feasible and widely acceptable in an influenza pandemic.
Ongoing concerns about the emergence of an influenza pandemic continue as the number of avian and human infections with the H5N1 virus mount [1, 2]. Adequate amounts of vaccine or antivirals are unlikely to be available early on in a pandemic, and the latter could become ineffective because of resistance . These factors have focused attention on the use of non-pharmaceutical public health interventions to inhibit human-to-human transmission and fueled interest in answering important questions about influenza epidemiology and transmission [4–9]. However, the most comprehensive assessments of the literature to date recognize the generally poor quality of evidence on which to base pandemic planning decisions [8–10]. In light of the need to prepare for a possible pandemic despite concerns about the poor quality of the literature, combining available evidence with expert opinion about the relative merits of non-pharmaceutical interventions for pandemic influenza may lead to a more informed and widely accepted set of recommendations.
At the request of the US. Department of Health and Human Services, we evaluated the evidence base for non-pharmaceutical public health interventions by reviewing recent published literature, including historical reviews, convening a meeting of experts, and formally eliciting and quantifying expert opinion about the relative efficacy and effectiveness of specific non-pharmaceutical interventions for pandemic influenza. Based on this collective evidence, we identified a set of recommendations for and against interventions that are specific to both the setting in which an intervention may be used and the pandemic phase, and which can be used by policymakers to prepare for a pandemic until scientific evidence can definitively respond to planners' needs. We also identified important areas of uncertainty that warrant further research.
Results of literature search
Remaining after exclusion of case reports and articles pertaining to vaccines, antiviral medications other medical countermeasures
Remaining after title and abstract review
Remaining after screen for relevance
Modified rating scheme and results for N = 168 articles
Documented extensive literature search; quantitative or qualitative summary
Summary of field or problem by an expert citing references obtained in a non-systematic manner
Prospectively randomized at individual or group level
Formal design, almost always a control group whether prospective or retrospective, and whether cross-section, panel, or case-control. Includes analysis of large dataset analysis.
Uses mathematical language to describe and predict biomedical and epidemiologic outcomes.
Case Reports or Series
Report of a (hopefully pertinent) case or series of cases, often with a perspective on the current state of affairs or the current literature
Diagnostic Test Studies
Studies of the laboratory or filed performance of a diagnostic test. Generally compare sensitivity and specificity to some gold standard
Evidence Based guidelines
Guidelines developed by bodies after review of the literature
Expert Opinion, Editorials & Commentaries
Opinion or "newsy" narratives
Elicitation of expert knowledge and opinion
Non-pharmaceutical public health interventions
Early rapid viral diagnosis
Surgical and N95 Masks
Other personal protective equipment*
Isolation of sick individuals
Provision of social support services to the isolated
Cancellation of group events
International and domestic travel restrictions
Participants qualitatively evaluated each intervention considering a broad range of factors, including efficacy (effects under ideal conditions) and various aspects of effectiveness (effects under real-world constraints). The latter included feasibility, cost, logistics, operational and infrastructure constraints, and acceptability in terms of concerns surrounding legality and ethics, equity, public confidence, and potential unintended consequences. In their deliberations, the experts also considered the different settings in which these interventions might be applied (healthcare facilities, community-based institutions, and private households). They also considered the epidemic phases in which the use of these interventions should be evaluated (no pandemic, no US pandemic, early localized US pandemic, and advanced US pandemic).
Following the meeting, we asked each expert to rate 200 unique intervention-setting-phase triads identified during the meeting based on the totality of their knowledge. Thirteen of seventeen responded. Ratings were on a scale of 1 to 5, with 1 being 'not recommended' and 5 being 'strongly recommended'. We scored the ratings using an adaptation of the RAND/UCLA Appropriateness Method [12, 13]. We first discarded the two extreme high and low ratings for each item. We then defined agreement as all ratings falling within a single 2-point range and all other outcomes as disagreement. Among those items for which there was agreement, items with ratings of 4 or 5 were classified as a recommendation for use, and items with ratings of 1 or 2 were classified as a recommendation against use .
Our formal ratings of the articles revealed few high quality studies to inform the evidence base for non-pharmaceutical interventions for influenza. The majority of topically relevant articles we identified were narrative reviews, case reports, observational studies or expert opinion, editorials and commentaries (Table 2). We found only 9 systematic reviews of relevant material and 3 randomized clinical trials. Additionally, few of the topically relevant articles were directly on-point.
In light of the evident lack of scientific evidence about specific non-pharmaceutical interventions in the context of seasonal or pandemic influenza, there was limited directly useable information from the majority of the studies identified in the formal Medline search. For this reason, we turned to expert opinion to inform and categorize the findings . Expert panels are often used to develop guidelines and recommendations when compelling evidence is lacking. Drawing on both qualitative discussion at the expert panel and quantitative results from the follow-up survey discussed above, we classified the non-pharmaceutical interventions into two broad categories, those whose use was recommended by the panel and those whose use was not recommended. Table 4 summarizes the results from the survey questionnaire, providing the complete list of non-pharmaceutical intervention-setting-phase combinations that were queried and the number and proportion of items for which there was agreement (41.5%) or disagreement (58.5%). We included relevant findings from the literature, where available, in our discussion of the specific interventions, and we cited some of the selected studies from the formal Medline search, as well as others that supplemented the search, to provide necessary background information when appropriate and to support some commonly held views about infection control activities. We also note below interventions about which there was disagreement or no recommendation by the panel.
Interventions recommended for use
Hand hygiene and respiratory etiquette
Hospital-based infection control measures such as hand hygiene and respiratory etiquette to prevent the spread of infection are widely supported in the literature and broadly accepted [15–20]. Many controlled studies have shown a protective effect of hand hygiene in reducing upper respiratory infections, although few of the infections studied were due to influenza [9, 21–27]. Some studies suggest that use of an alcohol-based hand sanitizer is more effective in preventing carriage of non-spore forming bacteria and direct spread of most infections than antimicrobial soap or no hand washing, but antimicrobial handwashing products have not been shown to offer an advantage over soap and water [9, 23, 28–34].
The experts recommended rigorous and routine hand hygiene as an important strategy for healthcare workers and the general public in all settings and at all phases of a pandemic, including prior to a pandemic (Table 4). However, important barriers to the effective use of hand hygiene were noted, including adherence, the supply and cost of commercially available disinfectant soaps and alcohol-based rubs, and the pervasive practice of hand-shaking. Experts also recommended respiratory etiquette as an important means of preventing transmission for all patients and providers in all pandemic phases, and in the community and/or home when the US pandemic is early and localized. Respiratory hygiene and cough etiquette is generally held to include covering the mouth and nose with a tissue or into the upper sleeve when coughing or sneezing, and refraining from spitting . However, they urged that the promotion of respiratory etiquette be coupled with a compelling public education campaign that includes information regarding the signs and symptoms of influenza.
Human surveillance and case reporting
We found little direct empirical evidence on the efficacy or effectiveness of surveillance and case reporting in the context of influenza. Nevertheless, in light of experience with SARS, the experts recommended both as important to containing the spread of a pandemic. Influenza surveillance supports a range of necessary preparedness activities, including: 1) providing information regarding the presence and epidemiology of influenza viruses in the community, 2) determining appropriate interventions, 3) targeting interventions, and 4) generating current accurate information for public health officials, providers and the public. While the experts agreed that human surveillance and case reporting are efficacious and likely to be effective during any pandemic phase, broad endorsement was qualified by concerns about resource constraints, especially in a large outbreak, potential difficulties in cooperation between providers and governmental and non-governmental entities, the cost of scaling up capacity to report and investigate influenza-like illness, privacy rights and the right to informed consent .
Rapid viral diagnosis
The key limitation of currently available rapid tests for influenza is suboptimal sensitivity, especially in adults [37–40]. New and more sensitive technologies for rapid diagnosis of influenza that can reliably identify influenza among patients with respiratory syndromes would greatly aid in the efficient allocation of limited resources such as isolation facilities. The experts agreed on the need for increased investment in the development and deployment of improved rapid diagnostic tests for influenza, arguing that such testing will be invaluable for effective surveillance and in managing all but the most advanced phases of a US pandemic. Moreover, since viral diagnosis of influenza is currently not routine practice, the experts reasoned that education regarding the importance of improved tests will be necessary to increase the adoption of such tests in the US health system. If new tests can be packaged in a way that facilitates use in non-clinical settings, their potential to facilitate disease containment efforts will be even greater. However, the lack of incentives for routine use of costly tests could limit development and production of new technologies, creating shortages in a pandemic emergency.
Provider and patient use of masks and other personal protective equipment
Isolation of the sick
The amount of influenza virus shed by symptomatic individuals is greater than in the asymptomatic phase, but viral shedding typically begins shortly after infection and before the onset of symptoms. This limits the efficacy of isolation except for individuals completely quarantined almost immediately after contact with an infected person . However, more recent studies report that when numbers are small, isolation in hospitals using appropriate infection control measures may be effective. While discussions were uniformly supportive of routine infection control measures, the experts did not agree on recommendations for mandatory isolation in any specific setting. This was because of the inconclusive nature of the evidence, the concern that healthcare facilities are likely to be rapidly overwhelmed, and that overflow into difficult to manage public settings such as arenas would be less effective. Moreover, mandatory isolation outside of healthcare settings, even if effective and enforceable, raises a range of legal, political and ethical issues that can, at a minimum, erode public acceptance of these policies. Despite the skepticism about mandatory isolation strategies, voluntary self-isolation in the home was recommended for all phases of a US pandemic.
Interventions whose use is not recommended
Masks and other personal protective equipment for the general public
With the exception of some evidence from SARS, we did not find any published data that directly support the use of masks, respirators, or other personal protective equipment by the public, or other steps such as disinfecting surfaces beyond usual practices. The expert's views were mixed. There was uncertainty regarding requirements for masks or respirators because of uncertainty about the relative roles of droplet versus aerosol transmission. Concerns about supply, competency in mask and especially respirator fitting and use, adherence by the public, and social impact of mask-wearing all served to undermine the panel's confidence in the feasibility and acceptability of widespread use. On the survey, experts recommended against the use of masks or respirators by the public prior to the arrival of pandemic influenza and in the early localized phase. For similar reasons, experts recommended against the public use of other protective equipment such as gowns, gloves and protective eye wear.
Mandatory social distancing measures
Although social distancing measures such as workplace closures, limitations on location-based gatherings and events, and mandated travel restrictions have been a recent focus of investigation, and some of these measures were implemented in Asia and North America during SARS, their effectiveness in an influenza outbreak has not yet been established [5, 8, 48]. Despite the propensity of influenza epidemics to be amplified in primary schools, data on the effectiveness of school closures for reducing community transmission are contradictory. Most empirical studies suggest a decline in community transmission rates of respiratory infections with school closures[49, 50], but the WHO Writing Group also noted older studies showing increases in the spread of disease and subsequent illness after a school holiday, and protective effects when schools remained open . Recent modeling studies generally support school closure and confinement in the home as an effective means of reducing overall attack rates within communities when coupled with antiviral prophylaxis, but predicting the effect of closing schools and workplaces is difficult, since infectious individuals may be displaced into other settings[47, 51, 52]. Models suggest that cancellation of non-essential public gatherings and restrictions on long-distance travel might help to decrease rates of transmission and overall morbidity, but the effectiveness of these interventions has not been quantified.
The experts generally thought that community restrictions could be considered on a case-by-case basis, for example, cancellation of an event to which thousands would travel. However, efforts to forcibly limit public assembly or movement were seen as legally and ethically problematic, especially when there is limited scientific evidence supporting such restrictions. There are also important practical and logistical limitations to mandatory long-term community restrictions and compulsory quarantine, in addition to the problem of likely public opposition to such measures[5, 53, 54]. The experts recommended against these restrictions when outbreaks were elsewhere, and they did not agree otherwise. The same is true for school closures.
Consistent with the literature, the experts contended that widespread and sustained screening of travelers would ultimately be impractical and inefficient as long as detecting asymptomatic shedding is not feasible. Difficulties with the rapid diagnosis of influenza means that travel bans and screening programs risk detaining a large number of symptomatic persons who do not have influenza. There is also the possibility of such measures leading to an international backlash, decreasing cooperation at a time when increased is needed. However, voluntary measures and guidelines would likely be more acceptable and thus more effective. The experts recommended against any mandatory travel restrictions in the advanced phases of a pandemic and did not recommend restrictions on domestic or international departures or entry screening when a pandemic is in the early localized phase.
We evaluated the evidence-base for non-pharmaceutical public health interventions in an influenza pandemic by reviewing the recent scientific literature, convening a multidisciplinary meeting of experts, and eliciting expert knowledge qualitatively and quantitatively. Despite the poor quality of the evidence, the use of expert opinion has enabled us to identify strategies that are likely to help slow influenza transmission in a pandemic setting and also do no harm. Our findings highlight the importance of specifying the setting in which a non-pharmaceutical public health intervention will be used, as well as when its use should be considered. Although the interplay of these factors and deep uncertainty about the relative efficacy or effectiveness of specific non-pharmaceutical public health interventions prevents us from conclusively pinpointing an optimal set of non-pharmaceutical public health interventions for every circumstance, our study provides some important insights about pandemic planning.
Consistent with others, we found that the published literature revealed scant confirmatory evidence on efficacy and overall effectiveness of non-pharmaceutical public health interventions in an influenza pandemic, effectively forcing policymakers to turn to expert opinion[8, 9]. Some infections control studies classified as systematic reviews, observational studies or evidence-based guidelines constituted stronger evidence,, at least for spread of respiratory disease. The remaining scientific evidence is of low strength (further research is very likely to change estimates of effect) or very low strength (effects are quite uncertain), specifically with respect to seasonal and pandemic influenza. The published literature consisted mainly of narrative reviews of past pandemics, contemporary observations, editorials, commentaries and case reports or series from common respiratory infections and SARS, and from generalized inferences from biology and pathophysiology, clinical epidemiology and mathematical modeling studies, rather than from randomized controlled trials evaluating interventions.
First, policymakers should actively promote personal responsibility for slowing spread of infection through good hand hygiene and respiratory etiquette in all settings and at all times. Use of disinfectant hand soaps and alcohol-based rubs should also be encouraged. Second, developing the capability and capacity for early rapid viral diagnosis should be a high priority. Third, healthcare providers need to be better trained to maximize the effectiveness of infection control measures, including use of masks, respirators, and other personal protective equipment. It may be reasonable to recommend limited use of personal protective measures in certain other settings such as mask-wearing by the ill or perhaps surface disinfection of very heavily trafficked public areas. However, other use of personal protective equipment by the general public is not recommended at this time. Fourth, and also consistent with others, we founds that widespread government mandates to segregate individuals, including isolation, quarantine, sheltering, location-based community restrictions, and travel restrictions, are less likely than voluntary measures to be recommended, especially over the longer-term. Instead, less invasive voluntary efforts to reduce social contact, especially self-isolation of the sick at home, self-quarantine of the exposed, and, when feasible, sheltering by the well ought to be widely supported. This will require education, persuasion, and social support to ensure that medical and non-medical needs are met, with the latter being central to the success of sequestration measures in all settings. Fifth, information needs are pervasive. Very little of the literature is on point, and the experts disagreed 60 percent of the time. Well-controlled observational and especially interventional studies are needed, especially in the context of seasonal influenza.
The demand for scientific evidence on non-pharmaceutical public health interventions for influenza is pervasive, and policy recommendations must rely heavily on expert judgment. In the absence of a definitive science base, our assessment of the evidence identified areas for further investigation as well as non-pharmaceutical public health interventions that experts believe are likely to be beneficial, feasible, and socially and politically acceptable in an influenza pandemic. Taken together, the literature and expert opinion reveal the kinds of explicit judgments required to translate existing knowledge into policy-relevant terms. These findings should be considered in forming national, state, local, and facility pandemic plans.
Supported by the US Department of Health and Human Services, Office of Emergency Public Health Emergency Preparedness. We would like to thank the conference participants: John M. Barry, Georges C. Benjamin, Wändi Bruine de Bruin, Jim Curran, Walter Dowdle, David Fidler, Harvey V. Fineberg, Baruch Fischhoff, Barbara Goldrick, Lawrence Gostin, David Heyman, James M. Hughes, Howard Markel, Allison McGeer, Thomas Murray, Michael T. Osterholm, Wing Hong Seto, and Isaac Weisfuse. In addition, we are indebted to Karen Ricci, Roberta Shanman, Stefanie Stern and Alice Taylor for technical assistance.
- Avian influenza (bird flu). [http://www.cdc/gov/flu/avian/outbreaks/current.htm]http://www.cdc/gov/flu/avian/outbreaks/current.htm
- World Health Organization: Avian influenze: assessing the pandemic threat. 2005, Geneva , World Health Organization, Report No. WHO/CDS/2005.29-Google Scholar
- Moscona A: Oseltamivir resistance--disabling our influenza defenses. N Engl J Med. 2005, 353 (25): 2633-2636. 10.1056/NEJMp058291.View ArticlePubMedGoogle Scholar
- National strategy for pandemic influenza: Implementation plan. 2006, Washington, DC , Homeland Security Council
- Gostin L: Public health strategies for pandemic influenza: ethics and the law. Jama. 2006, 295 (14): 1700-1704. 10.1001/jama.295.14.1700.View ArticlePubMedGoogle Scholar
- Inglesby TV, Nuzzo JB, O'Toole T, Henderson DA: Disease mitigation measures in the control of pandemic influenza. Biosecurity and Bioterrorism: Biodefense Strategy, Practice and Science. 2006, 4 (4): 366-375. 10.1089/bsp.2006.4.366.View ArticleGoogle Scholar
- Morse SS, Garwin RL, Olsiewski PJ: Public health. Next flu pandemic: what to do until the vaccine arrives?. Science. 2006, 314 (5801): 929-10.1126/science.1135823.View ArticlePubMedGoogle Scholar
- World Health Organization Writing Group: Nonpharmaceutical interventions for pandemic flu. Emerg Infect Dis. 2006, 12 (1): 81-87.View ArticlePubMed CentralGoogle Scholar
- World Health Organization Writing Group: Pandemic influenza, national and community measures. Emerg Infect Dis. 2006, 12 (1): 88-94.View ArticlePubMed CentralGoogle Scholar
- Markel H, Stern AM, Navarro JA, Michalsen JR, Monto AS, DiGiovanni Jr. C: Nonpharmaceutical influenza mitigation strategies, U.S. communities, 1918-1920 pandemic. Emerg Infect Dis. 2006, 12: 1961-1964.View ArticlePubMedPubMed CentralGoogle Scholar
- West SL, King V, Carey TS: Systems to rate the strength of scientific evidence. 2002, Rockville, MD , Agency for Healthcare Research and QualityGoogle Scholar
- Fitch K, Bernstein SJ, Aguilar MS, et al: The RAND/UCLA Appropriateness Method User's Manual. 2001, Santa Monica , RAND CorporationGoogle Scholar
- Shekelle P: The appropriateness method. Med Decis Making. 2004, 24 (2): 228-231. 10.1177/0272989X04264212.View ArticlePubMedGoogle Scholar
- Atkins D, Best D, Briss PA, Eccles M, Falck-Ytter Y, Flottorp S, Guyatt GH, Harbour RT, Haugh MC, Henry D, Hill S, Jaeschke R, Leng G, Liberati A, Magrini N, Mason J, Middleton P, Mrukowicz J, O'Connell D, Oxman AD, Phillips B, Schunemann HJ, Edejer TT, Varonen H, Vist GE, Williams JW, Zaza S: Grading quality of evidence and strength of recommendations. Bmj. 2004, 328 (7454): 1490-10.1136/bmj.328.7454.1490.View ArticlePubMedGoogle Scholar
- Jeffries DJ: Viral hazards to and from health care workers. J Hosp Infect. 1995, 30 Suppl: 140-155. 10.1016/0195-6701(95)90014-4.View ArticlePubMedGoogle Scholar
- Larson E: Handwashing: it's essential--even when you use gloves. Am J Nurs. 1989, 89 (7): 934-939. 10.2307/3426369.PubMedGoogle Scholar
- Pittet D: Improving adherence to hand hygiene practice: a multidisciplinary approach. Emerg Infect Dis. 2001, 7 (2): 234-240.View ArticlePubMedPubMed CentralGoogle Scholar
- Rotter ML: 150 years of hand disinfection--Semmelweis' heritage. Hyg Med. 1997, 22: 332-339.Google Scholar
- Rotter ML: Hand washing and hand disinfection. Hospital epidemiology and infection control. 1999, Philadelphia , Lippincott, Williams & Wilkins, 2nd ed., 1339-1355. 2nd ed.Google Scholar
- U.S. Centers for Disease Control and Prevention: Respiratory hygiene/cough etiquette in healthcare settings.
- Carabin H, Gyorkos TW, Soto JC, Joseph L, Payment P, Collet JP: Effectiveness of a training program in reducing infections in toddlers attending day care centers. Epidemiology. 1999, 10 (3): 219-227. 10.1097/00001648-199905000-00005.View ArticlePubMedGoogle Scholar
- Doebbeling BN, Stanley GL, Sheetz CT, Pfaller MA, Houston AK, Annis L, Li N, Wenzel RP: Comparative efficacy of alternative hand-washing agents in reducing nosocomial infections in intensive care units. N Engl J Med. 1992, 327 (2): 88-93.View ArticlePubMedGoogle Scholar
- Falsey AR, Criddle MM, Kolassa JE, McCann RM, Brower CA, Hall WJ: Evaluation of a handwashing intervention to reduce respiratory illness rates in senior day-care centers. Infect Control Hosp Epidemiol. 1999, 20 (3): 200-202. 10.1086/501612.View ArticlePubMedGoogle Scholar
- Luby SP, Agboatwalla M, Feikin DR, Painter J, Billhimer W, Altaf A, Hoekstra RM: Effect of handwashing on child health: a randomised controlled trial. Lancet. 2005, 366 (9481): 225-233. 10.1016/S0140-6736(05)66912-7.View ArticlePubMedGoogle Scholar
- Niffenegger JP: Proper handwashing promotes wellness in child care. J Pediatr Health Care. 1997, 11 (1): 26-31. 10.1016/S0891-5245(97)90141-3.View ArticlePubMedGoogle Scholar
- Sickbert-Bennett EE, Weber DJ, Gergen-Teague MF, Sobsey MD, Samsa GP, Rutala WA: Comparative efficacy of hand hygiene agents in the reduction of bacteria and viruses. Am J Infect Control. 2005, 33 (2): 67-77. 10.1016/j.ajic.2004.08.005.View ArticlePubMedGoogle Scholar
- White C, Kolble R, Carlson R, Lipson N, Dolan M, Ali Y, Cline M: The effect of hand hygiene on illness rate among students in university residence halls. Am J Infect Control. 2003, 31 (6): 364-370. 10.1016/S0196-6553(03)00041-5.View ArticlePubMedGoogle Scholar
- Bloomfield SF: Preventing infectious disease in the domestic setting: a risk-based approach. Am J Infect Control. 2001, 29 (4): 207-210. 10.1067/mic.2001.115685.View ArticlePubMedGoogle Scholar
- Ferson MJ: Infection control in child care settings. Commun Dis Intell. 1997, 21 (22): 333-337.PubMedGoogle Scholar
- Kotch JB, Weigle KA, Weber DJ, Clifford RM, Harms TO, Loda FA, Gallagher PN, Edwards RW, LaBorde D, McMurray MP, et al: Evaluation of an hygienic intervention in child day-care centers. Pediatrics. 1994, 94 (6 Pt 2): 991-994.PubMedGoogle Scholar
- Larson EL, Eke PI, Laughon BE: Efficacy of alcohol-based hand rinses under frequent-use conditions. Antimicrob Agents Chemother. 1986, 30 (4): 542-544.View ArticlePubMedPubMed CentralGoogle Scholar
- Picheansathian W: A systematic review on the effectiveness of alcohol-based solutions for hand hygiene. Int J Nurs Pract. 2004, 10 (1): 3-9. 10.1111/j.1440-172X.2003.00457.x.View ArticlePubMedGoogle Scholar
- Sandora TJ, Taveras EM, Shih MC, Resnick EA, Lee GM, Ross-Degnan D, Goldmann DA: A randomized, controlled trial of a multifaceted intervention including alcohol-based hand sanitizer and hand-hygiene education to reduce illness transmission in the home. Pediatrics. 2005, 116 (3): 587-594. 10.1542/peds.2005-0199.View ArticlePubMedGoogle Scholar
- Zaragoza M, Salles M, Gomez J, Bayas JM, Trilla A: Handwashing with soap or alcoholic solutions? A randomized clinical trial of its effectiveness. Am J Infect Control. 1999, 27 (3): 258-261. 10.1053/ic.1999.v27.a97622.View ArticlePubMedGoogle Scholar
- Centers for Disease Control and Prevention (CDC): Respiratory Hygiene/Cough Etiquette in Healthcare Settings. [http://www.cdc.gov/flu/professionals/infectioncontrol/resphygiene.htm]
- Greaves F: What are the most appropriate methods of surveillance for monitoring an emerging respiratory infection such as SARS?. J Public Health (Oxf). 2004, 26 (3): 288-292. 10.1093/pubmed/fdh155.View ArticleGoogle Scholar
- Ng EK, Cheng PK, Ng AY, Hoang TL, Lim WW: Influenza A H5N1 detection. Emerg Infect Dis. 2005, 11 (8): 1303-1305.View ArticlePubMedPubMed CentralGoogle Scholar
- Centers for Disease Control and Prevention (CDC): Lab Diagnosis of Influenza. [http://www.cdc.gov/flu/professionals/labdoagnosis.htm]
- World Health Organization: WHO recommendations on the use of rapid testing for influenza diagnosis. 2005Google Scholar
- Yuen KY, Chan PK, Peiris M, Tsang DN, Que TL, Shortridge KF, Cheung PT, To WK, Ho ET, Sung R, Cheng AF: Clinical features and rapid viral diagnosis of human disease associated with avian influenza A H5N1 virus. Lancet. 1998, 351 (9101): 467-471. 10.1016/S0140-6736(98)01182-9.View ArticlePubMedGoogle Scholar
- Centers for Disease Control and Prevention (CDC): Interim Guidance for the Use of Masks to Control Influenza Transmission. [http://www.cdc.gov/flu/professionals/infectioncontrol/maskguidance.htm]
- Bridges CB, Kuehnert MJ, Hall CB: Transmission of influenza: implications for control in health care settings. Clin Infect Dis. 2003, 37 (8): 1094-1101. 10.1086/378292.View ArticlePubMedGoogle Scholar
- Abdullah AS, Tomlinson B, Cockram CS, Thomas GN: Lessons from the severe acute respiratory syndrome outbreak in Hong Kong. Emerg Infect Dis. 2003, 9 (9): 1042-1045.View ArticlePubMedPubMed CentralGoogle Scholar
- Pang X, Zhu Z, Xu F, Guo J, Gong X, Liu D, Liu Z, Chin DP, Feikin DR: Evaluation of control measures implemented in the severe acute respiratory syndrome outbreak in Beijing, 2003. Jama. 2003, 290 (24): 3215-3221. 10.1001/jama.290.24.3215.View ArticlePubMedGoogle Scholar
- Seto WH, Tsang D, Yung RW, Ching TY, Ng TK, Ho M, Ho LM, Peiris JS: Effectiveness of precautions against droplets and contact in prevention of nosocomial transmission of severe acute respiratory syndrome (SARS). Lancet. 2003, 361 (9368): 1519-1520. 10.1016/S0140-6736(03)13168-6.View ArticlePubMedGoogle Scholar
- Institute of Medicine (IOM): Reusability of facemasks during an influenza pandemic. 2006, Committee on the development of reusable facemasks for use during an influenza pandemicGoogle Scholar
- Beigel JH, Farrar J, Han AM, Hayden FG, Hyer R, de Jong MD, Lochindarat S, Nguyen TK, Nguyen TH, Tran TH, Nicoll A, Touch S, Yuen KY: Avian influenza A (H5N1) infection in humans. N Engl J Med. 2005, 353 (13): 1374-1385. 10.1056/NEJMra052211.View ArticlePubMedGoogle Scholar
- Ferguson NM, Cummings DA, Cauchemez S, Fraser C, Riley S, Meeyai A, Iamsirithaworn S, Burke DS: Strategies for containing an emerging influenza pandemic in Southeast Asia. Nature. 2005, 437 (7056): 209-214. 10.1038/nature04017.View ArticlePubMedGoogle Scholar
- Heymann A, Chodick G, Reichman B, Kokia E, Laufer J: Influence of school closure on the incidence of viral respiratory diseases among children and on health care utilization. Pediatr Infect Dis J. 2004, 23 (7): 675-677. 10.1097/01.inf.0000128778.54105.06.View ArticlePubMedGoogle Scholar
- Valleron AJ, Flahault A: Do school holidays have an impact on influenza epidemics, then on mortality. Proceedings of the International Conference on Options for the Control of Influenza V, Okinawa, Japan, International Congress Series 1263. Edited by: Yawaoka Y. 2004, Amsterdam , ElesevierGoogle Scholar
- Germann TC, Kadau K, Longini IM, Macken CA: Mitigation strategies for pandemic influenza in the United States. Proc Natl Acad Sci U S A. 2006, 103 (15): 5935-5940. 10.1073/pnas.0601266103.View ArticlePubMedPubMed CentralGoogle Scholar
- Glass RJ, Glass LM, Beveler WE: Local mitigation strategies for pandemic influenza. 2005, Albuquerque , National Infrastructure Simulation and Analysis CenterGoogle Scholar
- Barbera J, Macintyre A, Gostin L, Inglesby T, O'Toole T, DeAtley C, Tonat K, Layton M: Large-scale quarantine following biological terrorism in the United States: scientific examination, logistic and legal limits, and possible consequences. Jama. 2001, 286 (21): 2711-2717. 10.1001/jama.286.21.2711.View ArticlePubMedGoogle Scholar
- Blendon RJ, Benson JM, DesRoches CM, Raleigh E, Taylor-Clark K: The public's response to severe acute respiratory syndrome in Toronto and the United States. Clin Infect Dis. 2004, 38 (7): 925-931. 10.1086/382355.View ArticlePubMedGoogle Scholar
- Bruine de Bruin W, Fischhoff B, Brilliant L, Caruso D: Expert judgments of pandemic risks. Global Public Health. 2006, 1 (2): 1-16. 10.1080/17441690600673940.View ArticleGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/7/208/prepub