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.

On Friday, 1,106 new cases of Covid-19 were added to the city's tally, taking the total number of cases to 17,386. However, with the addition of 1,106 cases to Delhi's tally of 16,281 from Thursday, Friday's cases should have stood at 17,387. There was no immediate clarification from the government on the discrepancy on Friday evening.

With an average of 5,624 daily tests performed in the last seven days, the avera...