Effect of testing strategy to support existing from lockdown
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.
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.
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%)
Gupta et al. 
Lower restrictive measures along with increased testing during lockdown relaxation have the same effect as stricter physical distancing measures with lower levels of testing.
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.
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.
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.
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.
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.