|Sr. No.||Country||Study||Testing strategy||Effect of testing strategy to support existing from lockdown|
|1||Switzerland||Muller et al. ||Daily random testing||
• Daily random testing will reduce the delay between changes in policy and the observation of their effects|
• Additional testing capacity of 15,000 per day carried out randomly would provide data about the evolution of the epidemic during exit.
|2||UK||Panovska-Griffith et al. ||Active testing of symptomatic population||Increased levels of testing (between 59 and 87% of symptomatic people tested at some point during an active COVID-19 infection) and effective contact tracing and isolation for infected individuals can prevent rebound of the epidemic during reopening of schools and society in UK.|
|3||Mendoza, Argentina||Mayorga et al. ||Extensive testing capacity to detect asymptomatic individuals||
Massive COVID-19 screening to detect around half of the asymptomatic and very mildly affected individuals would not need strict suppressive actions- if 45% of asymptomatic individuals are detected through testing and are isolated, there would not be a need for lockdown.|
(This modelling exercise was undertaken with assumptions- a) imposing lockdown when ICU beds occupancy reaches 50%, and b) relaxing restrictions when this value reaches 30%)
|4||India||Gupta et al. ||Increased testing||Lower restrictive measures along with increased testing during lockdown relaxation have the same effect as stricter physical distancing measures with lower levels of testing.|
|5||Italy||Li et al. ||Upscaling the testing capacity||
• True number of infected cases and relative testing capacity are better determinants to guide lockdown exit strategies, compared to R.|
• Testing capacity of at least 16 times the number of newly infected cases is required before considering exit at regional levels in Italy.
|6||Australia||Lokuge et al. ||Community-based surveillance strategy using pooling of samples||
• Exhaustive testing of patients with respiratory symptoms in the community is the most efficient and feasible means of detecting community transmission of COVID-19 during relaxation of measures.|
• Pooling allows increased case detection when testing capacity is limited, even given reduced test sensitivity.
|7||Italy||Pernice et al. ||Targeted testing in high-risk groups and contact tracing||
• Contact tracing and targeted testing in high-risk groups would provide the same result as larger number of untargeted (or less targeted) tests.|
• Targeted testing approach is more efficient and feasible.
|8||NA||Bej et al. ||Pro-active testing (testing beyond those who show symptoms)||• Compared effects of different exit strategies with high/low levels of pro-active testing. Strategies that lack high levels of pro-active testing led to a second wave of infection.|
|9||USA||Tam et al. ||Expanding testing capacity and encouraging early testing||• Infection rate can be decreased by increasing the sum of testing rate and recovery rate of asymptomatic individuals, after lifting the stay-at-home orders.|