Karachi''s positivity ratio nears 22pc amid Covid surge Pakistan reported more than 400 coronavirus cases for a second consecutive day on Sunday as Karachi''s positivity rate was recorded as 21.71 per cent — the highest in the country. Data released by the National Institute of Health (NIH) showed that 406 Covid-19 cases were reported during the last 24 hours. A day earlier, 435 cases were reported — the highest number since March 22. According to the NIH, 14,437 tests were conducted during the last 24 hours. The positivity rate was recorded as 2.81pc while two more deaths were also reported. In addition, 94 patients were in critical care, up from 87 a day prior. Meanwhile, a city-wise breakdown of the positivity rate showed that Karachi''s was the highest at a whopping 21.71pc, followed by Mardan with 8.77pc and Hyderabad with 8.51pc. In addition, Islamabad''s was recorded as 3.45pc while Peshawar''s was 3pc. ''Virus behaving like a roller coaster'' Talking to Dawn , University of Health Sciences (UHS) Vice Chancellor Dr Javed Akram said the virus was behaving like a "roller coaster". “The country will face similar situations for a few years,” Dr Akram said, suggesting that restrictions should be imposed once again as they would not only bring cases down but also help overcome the prevailing energy crisis.