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BMC Public Health

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Occupational blood exposures in health care workers: incidence, characteristics, and transmission of bloodborne pathogens in South Korea

  • Ju Hyun Lee1,
  • Junhyeon Cho1,
  • Yung Jung Kim2,
  • Sang Hyuk Im1,
  • Eun Sun Jang1,
  • Jin-Wook Kim1,
  • Hong Bin Kim1 and
  • Sook-Hyang Jeong1, 3Email author
Contributed equally
BMC Public HealthBMC series – open, inclusive and trusted201717:827

https://doi.org/10.1186/s12889-017-4844-0

Received: 24 November 2016

Accepted: 11 October 2017

Published: 18 October 2017

Abstract

Background

Health care workers (HCWs) are at high risk for occupational blood exposures (OBEs) and transmission of bloodborne pathogens. This study elucidated the incidence rate and epidemiological characteristics of OBEs among HCWs and investigated the pathogen transmission rate for hepatitis B virus (HBV), hepatitis C virus (HCV), and human immunodeficiency virus (HIV).

Methods

Self-reported OBEs from January 1, 2011 to December 31, 2015 were obtained from the electronic recording system. OBE incidence densities per 100 person-years and per 100 bed-years were calculated with a 5-year trend analysis. OBE characteristics and pathogen transmission rates were evaluated.

Results

Among 10,452 HCWs and 1072 average yearly beds, 1076 OBEs were reported. OBE incidence rate was 5.6 cases per 100 person (full-time equivalent)-years and 20.3 per 100 bed-years. Incidence rate decreased and was significantly associated with a decrease of beds served per HCW. Housekeeping showed the highest OBE rate (14.8%) followed by doctors (8.5%) and nurses (6.2%). OBEs occurred in wards, emergency rooms, and operating rooms (38.1%, 13.3% and 12.2%, respectively) via percutaneous (86.7%) and mucocutaneous exposures (13.2%). Of OBEs associated with HBV (n = 133), HCV (n = 126), and HIV (n = 25), only one led to an infection (HCV; transmission rate of 0.8%). Neither HBV nor HIV infection occurred.

Conclusions

OBE incidence rate in a Korean university hospital was 5.6 cases per 100 person-years and 20.3 per 100 bed-years and was related to HCW workload and work proficiency. Though the actual bloodborne pathogen transmission rate was low, efforts to prevent OBE should be made for hospital safety.

Keywords

Healthcare workersNeedlestick injuryOccupational blood exposureHepatitis C virusHepatitis B virusHuman immunodeficiency virus

Background

Healthcare worker (HCW) is defined as a person whose activities involve contact with patients or patient bodily fluids [1]. This includes nurses, physicians, pharmacists, technicians, morticians, dentists, students, contractors, attending clinicians, public safety workers, emergency response personnel, health care waste workers, first aid providers, and volunteers. An occupational blood exposure (OBE) is a percutaneous injury (e.g. a needlestick or cut with a previously used sharp medical device) or contact between a mucous membrane or non-intact skin (e.g. exposed skin that is chapped, abraded or afflicted with dermatitis) and blood, tissue, or other body fluids that may place a HCW at risk of hepatitis B virus (HBV), hepatitis C virus (HCV), or human immunodeficiency virus (HIV) infection [1].

The World Health Organization (WHO) estimated that each year, of the 35 million HCWs worldwide, 3 million experience percutaneous exposure to bloodborne pathogens (2 million to HBV, 0.9 million to HCV, and 170,000 to HIV [2]). These injuries result in 70,000 HBV infections, 15,000 HCV infections, and 500 HIV infections. Moreover, OBEs result in substantial psychological stress, such as job-related depression [35] and considerable management costs [6].

Though health care organizations maintain OBE control plans and government-regulated employee protection systems, healthcare-associated infections affecting HCWs remain poorly attended to, and very little systematic research regarding OBE and subsequent infections has been conducted. Moreover, the epidemiology and treatment of bloodborne infections, as well as hospital occupations, are dynamically changing. Thus, the continuous monitoring of OBE status and consequences is needed.

The aims of this study were to elucidate the incidence rate and epidemiological characteristics of OBEs among HCWs and to investigate the transmission rate of HBV, HCV and HIV through OBEs in a Korean university hospital.

Method

Study population

This retrospective cohort study involved HCWs at Seoul National University Bundang Hospital (Korea) over a 5-year period from January 1, 2011 to December 31, 2015. This resulted in 10,472 HCWs and 1072 average yearly beds, with a mean bed occupancy rate of 92%. Inclusion criteria for HCWs included full-time and part-time hospital staff for whom working times and occupation types were known for the full range of hospital employment. Full-time equivalent (FTE) work time was defined as 40 h a week and 52 weeks a year. In the case of interns and resident doctors on rotation duty, a monthly average number was calculated and converted to a 1 year equivalent. For part-time and temporary contract workers, dates and hours of employment were checked and converted to FTE units.

Several job categories, such as call center employees, public service workers, business logistics teams, funeral hall workers, and medical students without direct patient contact were excluded.

Data collection

In 2011, this university-affiliated tertiary hospital integrated into the electronic health care recording system a user-friendly HCW self-reporting system for OBEs that was managed by the Occupational Safety and Health Office. In order to encourage self-reports, the hospital financially rewarded (~300 USD) departments that not only reported a high number of OBEs but also proposed reasonable ideas for OBE intervention and/or patient safety issues. This was done every 3 months and was started with the integration of the OBE reporting system (Oct 2010). This study was approved by the Institutional Review Board of Seoul National University Bundang Hospital (IRB No. B-1603/340–110), and informed consent was waived because the study used retrospective data.

Each OBE report included brief employee and exposure information. Employee information included the employee’s age, sex, designated department, occupation type, history of hepatitis B vaccination, and result of hepatitis B antibody test. Exposure information included exposure date, location, type (percutaneous injury, mucocutaneous exposure, and others), exposed body site, and route of exposure (e.g. preparing for procedure and sorting out materials, performing invasive procedures, organizing materials after procedures, handling clinical specimens, garbage disposal, and others). In the case of percutaneous injury, needle type and whether the needle was blood stained were checked. Mucocutaneous injury was defined as injury related to blood or bodily fluids. Several invasive procedures were specified, including blood sampling, operation, intravenous administration of medicine, blood sugar test, and needle insertion/removal. Post procedural material organization was subdivided into recapping, manual needle withdrawal from syringe, device or needle disposal, surgical drape organization, and tray transportation. Clinical specimen handling was subdivided into putting away clinical specimens, transporting clinical specimens, and others. Waste handling and disposal were subdivided into organizing a needle box, handling boxes containing infectious waste, cleaning the hospital, and others. If none of these options were applicable, one could add details in the report. HBV surface antigen (HBsAg), anti-HCV, and HIV test results of the source patients were determined when possible.

Statistical analysis

OBE incidence rate was calculated as number of OBEs reported each year (over the course of 5 years) per 100 HCWs per year and per 100 average yearly bed number. The incidence rate was the number of new FTE cases per population at risk in a given time period, and we used the sum of the person-time of the risk populations as the denominator.
$$ \mathbf{Incidence}\mathbf{rate}=\frac{\boldsymbol{Numberof}\ \boldsymbol{OBE}}{\boldsymbol{Totaltimeexperienced}\ \boldsymbol{by}\ \boldsymbol{population}\ \boldsymbol{at}\ \boldsymbol{risk}}\times 100 $$
$$ \mathbf{Incidence}\mathbf{rate}=\frac{\boldsymbol{Numberof}\ \boldsymbol{OBE}}{\boldsymbol{Numberof}\boldsymbol{averageyearlybeds}}\times 100 $$

Annual trends in incidence rate were analyzed using Poisson regression analysis. Each item in the self-reporting system data was coded and entered into a database. SPSS v.22.0 software package for Microsoft Windows was used for analysis. A P value <0.05 was considered statistically significant.

Results

Incidence rate of occupational blood exposures during 2011–2015

Over the 5-year study period, there were 10,452 HCWs, a 1072 average yearly bed number, and 1076 OBEs reported. The mean OBE incidence rate for 5 years was 5.6 per 100 person-years and 20.3 per 100 bed-years. Annual OBE incidence rate is illustrated in Fig. 1. The OBE incidence rate showed an annual 6% decrease, which was statistically significant (Incidence rate ratio [IRR], 0.94; 95% Confidence interval [CI] 0.90–0.98, p = 0.006). Incidence rate in 2013 was significantly lower than other years (IRR, 0.77; 95% CI 0.66–0.91, p = 0.002). In 2013, the number of employees sharply increased in preparation for the opening of a new hospital wing.
Fig. 1

Incidence rate of occupational blood exposures at Seoul National University Bundang Hospital during 2011–2015. The solid line shows annual incidence rate. The dotted line shows the Poisson regression and incidence rate ratio, 0.94; 95% Confidence interval 0.90–0.98, p = 0.06

To determine whether OBE incidence rate was related to HCW workload, the annual number of employees per average daily beds served was calculated. It was 3.9 (3591/910) in 2011, 4.4 (3973/908) in 2012, 4.5 (4841/1068) in 2013, 4.3 (5134/1189) in 2014, and 4.2 (5339/1283) in 2015, showing that the highest number was in 2013 (Fig. 2).
Fig. 2

Annual HCW to average daily bed number ratio in Seoul National University Bundang Hospital in 2011–2015. The grey colored line shows annual HCW to average daily bed number ratio. It was 3.9 (3591/9110) in 2011, 4.4 (3972/908) in 2012, 4.5 (4841/1068) in 2013, 4.3 (5134/1189) in 2014, and 4.2 (5339/1283) in 2015, showing that the highest number was in 2013. HCW: healthcare worker

Epidemiological characteristics and related factors of OBEs

Detailed OBE characteristics are summarized in Table 1. Time between OBE occurrence to reporting was 0.5 ± 4.5 days (mean ± standard deviation [SD]), and 75% (802 cases) of all incidents were reported on the same day. The majority of incidents occurred in clinical wards (410 cases, 38.1%), followed by the emergency room (143 cases, 13.3%) and operating room (131 cases, 12.2%). According to occupational category, 511 (45%) of the OBEs occurred in the nurse group, 214 (20%) in the doctor group, and 131 (12%) in the housekeeper group. In the doctor group, interns (n = 76), residents (n = 54), and fellows (n = 33) accounted for most of the exposures (76%). Notably, the highest exposure rate (incidence of OBEs per 100 persons for each occupation) was found in housekeepers (14.8%, 131/884) followed by nurses (8.5%, 511/5995), doctors (6.2%, 214/3437), technicians (6%, 98/1609) and nurse-assists (4.3%, 118/2459) (Fig. 3). Circumstances leading to OBEs of HCWs are shown in Table 2. OBEs most often occurred while examining patients (45%, 482 cases) and was followed by organizing materials after procedures (28%, 298 cases), and disposing of garbage and others (17%, 175 cases,).
Table 1

Epidemiological characteristics and type of occupational blood exposures in healthcare workers during 2011–2015 (n = 1076)

Variables

Number (%)

Agea

34.6 ± 11.5

Sex (n = 1035)b

 Female/Male

851/184 (82.2/17.8)

Occupation

 Doctor

214 (19.9)

 Nurses

511 (47.4)

 Nurse-assist

118 (11.0)

 Housekeeper

131 (12.2)

 Technician

98 (8.9)

 Others

4 (0.7)

Exposed place

 Clinical ward

410 (38.1)

 Emergency room

143 (13.3)

 Operating room

131 (12.2)

 Laboratory

104 (9.7)

 Treatment room

96 (8.9)

 Outpatient department

84 (7.8)

 Others

108 (10.0)

Working shiftc

 Morning

515 (47.7)

 Evening

438 (40.8)

 Night

123 (11.5)

Exposed body site

 Hands and fingers

917 (85.2)

 Eye, mouth, damaged skin

114 (10.6)

 Others

45 (4.2)

Type of injury

 Percutaneous injury

933 (86.7)

 Mucocutaneous exposure

143 (13.2)

Percutaneous injury (n = 933)

 Contaminated with blood

 

  Yes

670 (71.8)

  No

263 (28.2)

 Needle type

  Hollow bore needle

706 (75.7)

Variables

Number (%)

 Solid needle

119 (12.8)

 Othersd

108 (11.6)

aValue represented mean ± standard deviation

bThe cases with missing information were excluded

cMorning shift; 6 am-2 pm, evening shift; 2 pm–10 pm, night shift; 10 pm-6 am

dLancet, scalpel, razor, scissors, trocar, staples etc.

Fig. 3

Exposure rate by occupation. Exposure rate was calculated by the number of OBE per number of HCW by occupation category. Housekeepers had the highest rate (14.8%, 131/884) and was followed by nurses (8.5%, 511/5995), doctors (6.2%, 214/3437), technicians (6%, 98/1609) and nurse-assists (4.3%, 118/2459). OBE: occupational blood exposure; HCW: healthcare worker

Table 2

Circumstances leading to occupational blood exposures of healthcare workers during 2011–2015 (n = 1076)

Variables

Number (%)

Direct patient care

482 (44.8)

 Invasive procedures

115 (23.9)

 Blood sampling

111 (23.0)

 Operation

94 (19.5)

 Intravenous administration of medicine

67 (13.9)

 Blood sugar test

40 (8.3)

 Inserting or removing needle

31 (6.4)

 Others

24 (5.0)

Organizing materials after procedure

298 (27.7)

 Disposal of device or needle

148 (49.7)

 Manual withdrawing of a needle from syringe

52 (17.4)

 Recapping a used needle

42 (14.1)

 Transportation of devices after procedure

33 (11.1)

 Others

23 (7.7)

Disposing garbage and others

175 (16.3)

 Organizing medical waste box

89  (50.9)

 Cleaning the hospital beds or instruments

36 (20.6)

 Organizing needle box

24 (13.7)

 Organizing non-medical waste box

17 (9.7)

 Others

9 (5.1)

Handling clinical specimens

76 (7.1)

 Putting the specimen into the specimen bottle

65 (85.5)

 Transporting the specimens

10 (13.2)

 Others

1 (1.3)

Preparing procedure or sorting out materials

32 (3.0)

Others

13 (1.2)

The monthly OBE occurrence distribution is illustrated in Fig. 4. The monthly average OBE incidence was highest in March (20.8 cases) and April (20.2 cases) and then decreased over the year with the exception of November. January and February showed the lowest OBE incidence. New hospital employees enter in March, and November is the month of duty shift for Interns and Resident doctors in this hospital. Therefore, work proficiency may be related to OBE occurrence.
Fig. 4

The average number of occupational blood exposure for each month of the year. The monthly average incidence of occupational blood exposures during the 5 years of study period was highest in March (20.8 cases) and April (20.2 cases), and then it decreased over the course of the year with the exception of November. January and February showed the lowest incidence throughout the year

Transmission rates of HBV, HCV and HIV

Of the reported 1076 blood exposure cases, the number of cases with available patient information was 681 for HBV, 680 for HCV, and 657 for HIV. Of these, the number of patients positive for HBsAg, anti-HCV, and anti-HIV were 133 (19%, 133/681), 126 (18.5%, 126/680), and 25 (3.8%, 25/657), respectively. Because of our hospital’s strict OBE system, all reported cases underwent initial blood tests within 24 h of the exposure, and almost all of them were followed for up to 6 months.

Only one HCW became infected with HCV, demonstrating a HCV transmission rate of 0.8% (1/126). Neither HBV nor HIV infection occurred. However, 12 HCWs received HBV vaccination and/or HB immunoglobulin, and 16 HCWs received prophylactic anti-HIV medications for 4 weeks.

The employee infected with HCV was an orthopedic surgeon fellow. During an operation, a scalpel contaminated with blood from a patient co-infected with HBV and HCV was dropped, cutting the surgeon’s heel. He presented with symptomatic, acute hepatitis C 8 weeks after the incident, undertook pegylated interferon and ribavirin therapy for 6 months, and recovered from HCV infection. In reaction to the incident, he experienced severe stress and transient depression.

Discussion

This study found an OBE incidence rate of 5.6 per 100 person-years and 20.3 per 100 bed-years in a Korean university hospital. Among job categories, exposure rate was highest among housekeepers, followed by nurses and doctors. Of the 1076 incidents, one HCV infection developed, showing that the actual infection rate was low, despite the high exposure number.

Our five-year OBE incidence rates (5.6 per 100 person-year and 20.3 per 100 bed-year) were higher than those previously reported in South Korea (2.92–4.29 per 100 person year) [79]. A 2011 US study reported an OBE incidence rate of 2.67 per 100 person years. In 2014, the Exposure Prevention Information Network (EPINet) reported 24.7 OBEs per 100 average daily census of occupied hospital beds. It was calculated as the total number of needlestick injuries reported during a specific date range (numerator) over the number of occupied hospital beds in an institution for the same date range (denominator) [10].. In 2005, WHO reported the annual incidences of sharps injuries for 14 subregions. Incidence ranged from 0.18 to 4.68 sharps injuries per HCW per year [3]. Notably, existing OBE reports have shown variability in study durations, hospital characteristics, and methodologies for incidence rate estimation. They also share limitations related to insufficient study duration, lack of inclusion of every HCW and consideration of unreported cases [1114].

In contrast, our study showed a relatively higher level of incidence rate compared to previous studies. The ease of OBE reporting in addition to the financial incentive provided by the hospital to departments with high OBE report rates and submission of HCW and patient safety ideas may have contributed to this finding. The high rate of same-day incident reports may support this notion. Studies show HCW may become desensitized to the dangers of blood exposure due to repetitive experiences of such incidents [15]. In this regard, emphasis on reporting OBE may continuously raise awareness of incidents and allow individuals to properly deal with OBE risks. To prevent OBEs and to encourage OBE reporting, the hospital has implemented orientation training for new employees and annual continuing education for all employees. Also, the hospital’s Occupational Safety and Health Office offers additional education for its high OBE risk departments.

Among the observed 5 years, OBE incidence rate was the lowest in 2013. In 2013, the number of caregivers increased sharply due to the opening of a new hospital wing. Nonetheless, blood sampling and other medical sharps work practices remained similar between the old and new hospital areas. The number of employees per bed was a record high in 2013 and was presumed to have had some impact on lowering the OBE incidence rate. Prakash K et al. reported that employee work intensity affected OBE incidence [16]. Ayas NT et al. identified that percutaneous injuries were more frequent in those with extended work hours [17]. Thus, the decrease in OBE incidence and corresponding increase in employee per bed in 2013 support excessive workloads, inadequate HCW to patient ratio, and fatigue as possible contributing factors to increased OBE.

Most OBE studies have included only nurses or have reported that nurses most often experience blood exposures, even when the entire medical team is included in the study. This is because the proportion of nurses is high among medical professionals. Our data indicated that nurses represented most of the reported incidents, in terms of absolute numbers, while the rate of occurrence was highest among housekeepers. The housekeeping group is involved in cleaning the hospital, disposing hospital and biomedical waste, organizing materials after procedures, and more. The current study found that blood exposures related to housekeeping work made up 19% of total incidents. Some were caused by discarding sharp devices in inappropriate places such as tables, trays, general wastebaskets, laundry, and more. As information on exposed blood cannot be traced back in these cases, more attention should be paid to post-exposure prophylaxis or infection. Saini S et al., showed that sanitary staff had a low level of knowledge about biomedical waste management rules (14%) when compared to doctors (80%) and nurses (60%) [18]. Mathur V et al. reported that regarding practices related to biomedical waste management, sanitary staff were ignorant on all the counts [19]. Megha K et al. identified that 48.7% sanitary staff were not trained [20]. Most hospital cleaning staffs are either part-time or temporary contract workers. Consequently, compared to other HCWs, they are less reachable by the hospital infection control management system. Future directions must focus on strengthening OBE prevention among the cleaning staff through safety education, safe disposal of sharp medical devices, as well as provision and use of protective equipment.

The monthly incidence of OBEs during the 5 years was the highest in March (20.8 cases) and April (20.2 cases) and decreased over the course of the year with the exception of November. In Korea, the new semester begins in March. Many new employees are hired during this time and are not accustomed to their work in March and April. Every November, 4th year resident doctors leave the hospital to prepare for a national examination, and little to no extra staff is hired to cover their absence. Our study showed that during the month of November, the overall work load increased and work proficiency transiently decreased. Therefore, employee job proficiency was associated with OBE incidence in this study. Likewise, Lee JJ et al. reported that needlestick injury events tend to occur in interns with lesser clinical skill and occur during a period when new interns and residents join the clinic [21]. Other studies have identified similar findings [22, 23].

Of the 1076 incidents, one HCV case led to infection with a 0.8% transmission rate. However, there were no HBV and HIV infections (0% transmission rate). Compared to exposure frequency, the rate of actual infection was low. As recommended by the Centers for Disease Control and Prevention, all HCWs at our institution are required to be vaccinated against HBV [24]. Accordingly, a majority (914) of the OBE reporting HCWs were anti-HBs positive. Previous studies have reported the risk of HBV transmission as 30% in susceptible HCWs without post-exposure prophylaxis or adequate hepatitis B vaccination; HCV infection risk as 0.5% (but considered null if exposure was to non-viremic patients); and <0.3% for HIV [2529]. Eskandarani HA et al. reported no HIV, HBV or HCV transmission for over 10 years among OBE reporting HCWs in Denmark, showing that despite frequent OBE among HCWs, the risk of infection was low [30]. HCWs have relatively high anti-HBs positive rates due to mandated hepatitis B vaccinations. Moreover, patients who receive hospital treatment have low viral loads due to antiviral medication; therefore the frequency of actual infections is expected to be low. The present study showed a low seropositive conversion rate in HCWs following OBE. The hospital’s infection control management system (e.g. post-exposure prophylaxis administration) likely contributed to the low rate. However, even with low seropositive conversion rates, primary OBE prevention, in particular adherence to the universal precautions, must remain a priority at any healthcare setting worldwide.

In this study, the HCV infected HCW experienced depressive moods, anxiety, and weight loss caused by excessive stress. In addition to initial concerns, there may be extended periods of anxiety and distress as testing for bloodborne pathogens can last for months. In this regard, Sohn J-W et al. reported that HCWs with OBEs exhibited higher levels of anxiety and depression after injury [35]. Particular attention must be directed towards the psychological sequaeles of OBEs in HCWs.

This study had several limitations. First, the authors of this article acknowledge that sharps with injury prevention features (SIPFs) are an important intervention to prevent OBEs. There was some use of SIPFs in the hospital, however, the related data was unavailable, and therefore, our analysis did not address this. Second, the study was limited to HCW in a tertiary hospital; thus the results may not be generalizable to other settings. Nonetheless, this study examined a large and diverse population, and OBEs were studied with consideration to specialty and occupation. Third, our analysis does not take into account several occupational categories including medical students. Fourth, like all survey studies, response rate can be underestimated, and reporting bias is possible.

Conclusion

Our study suggests that the incidence rate of OBE is higher than expected, and housekeepers are at highest risk of OBEs. Moreover, workload intensity and proficiency influence OBE incidence. Every effort should be made to prevent occupational blood exposures through implementation of safe working conditions and education. Although measures to deal with the psychological problems related to OBE are needed, reassurance also seems to be important given the results that show transmission rate is low compared to the frequency of exposure.

Abbreviations

HBsAg: 

HBV surface antigen

HBV: 

Hepatitis B virus

HCV: 

Hepatitis C virus

HCW: 

Health care worker

HIV: 

Human immunodeficiency virus

OBE: 

Occupational blood exposure

WHO: 

The World Health Organization

Declarations

Acknowledgements

We are grateful to Yejoo Jeon for her professional English editing of this paper, and Dr. Soyeon Ahn for her statistical consultation for this study.

Funding

No financial support for this study was received.

Availability of data and materials

The datasets generated and/or analysed during the current study available from the corresponding author on reasonable request.

Authors’ contributions

JHL, JHC and SHJ had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis; Study concept and design: SHJ, JHL and JJC; Acquisition of data: JHL JJC and YJK; Analysis and interpretation of data: JHL JJC, YJK, ESJ, and SHJ; Drafting of the manuscript: SHJ, JHL and JJC; Critical revision of the manuscript for important intellectual content: SHI, HBK, ESJ, JWK; Statistical analysis: JHL JJC and SHJ. All authors read and approved the final manuscript.

Ethics approval and consent to participate

The project was approved by the Institutional Review Board (IRB) of Seoul National University Bundang Hospital for review of medical records (IRB number 1–1603/340–110), and the requirement for informed consent was waived.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Authors’ Affiliations

(1)
Department of Internal Medicine, College of Medicine, Seoul National University
(2)
Occupation Safety and Health Office, College of Medicine, Seoul National University
(3)
Department of Internal Medicine, Seoul National University Bundang Hospital

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