New Delhi, May 30 -- With Delhi registering more than 1,000 cases of coronavirus disease (Covid-19) for the second day in a row on Friday, the proportion of tests returning a positive result continued to rise even with the number of tests going up, prompting experts to call for a more aggressive and randomised testing strategy.

With an average of 5,624 daily tests performed in the last seven days, the average daily positivity - or the percentage of people who test positive in the last week - was 12.6% for the week ending May 29. Last Friday, the average daily positivity rate for the seven days before it was 9.9% and the corresponding number was 6.4% for the week before. In the last 30 days, this average has nearly doubled from 6.5% on May ...