The minimum sample of individuals who would need to be tested would depend on the anticipated rate of covid-19 prevalence in a region Despite efforts to ramp up covid-19 testing, India remains among countries with the lowest testing rate.
The lack of surveillance has meant that there is no credible estimate of the true number of infected individuals in India. A new article in The Lancet by S.V.
Subramanian and K.S. James of the Harvard Centre for Population and Development Studies recommends that India use the National Family Health Survey (NFHS) mechanism to monitor the spread of covid-19 in the population.
In the absence of universal testing, a random sample-based framework should be used for testing, they argue. Since NFHS has a ready