There is a huge information about corona pandemic. There are so many cases ( about 200) in nagpur( Maharashtra, india) are daignosed negative , but guys in reality, they are positive and infected by corona virus. The daignosis is completed at mumbai. 63 of them are hospitalized. 3 persons into 63 persons are doctors. One of them - dr. Kamlesh kumar is on ventilator. He fought between life and death.
In short , we can say that it is either fault of daignosis machines( PCR) or corona virus is daignosed sometime later after infection when it is multiply enough number in the human body. However, the same problem has been faced by germany, italy, USA, spain, china and other countries. So we can say that it is daignosed sometime later after infection, Because every can not be found same fault.
It is a big nightmare for us. Because , according to this, there are so many peoples at roads that infected sometime ago and reportd as nevative. So we have only one option to fix that- stay home, work from home