New Delhi,, Nov. 23 -- Repeated, widespread testing with quick results is more effective in controlling an outbreak than using a more accurate test, according to two research papers published recently that draw on a crucial way the Sars-Cov-2 behaves: people are most infectious in the first week of their illness, when the viral load in their upper respiratory tract is at its highest.

The findings hold significance for a city like Delhi where the proportion of tests turning positive has consistently been higher than the acceptable limit of 8% for weeks now, and officials are at present working on a strategy on how best to increase tests while maintaining a balance between the more reliable but slow RT-PCR test and the quick but low-sensit...