Two positives can still make a negative
Two positives can still make a negative May 5, 2021, 7:35 AM IST By Ramesh Bijlani To be found Covid-positive spells fear, panic, isolation and depression – everything negative. A positive attracting something negative is not inevitable. But before that, let us see what being Covid-positive means. Suppose we devise a test that detects the presence of food in the mouth. The sensitivity of the test is such that the result is positive in anybody who has had a meal within the last one hour. Since we have three meals a day, in tests done at random throughout the day, about one-...