2020 की शुरुआत में ही जो लोग आए थे कोरोना की चपेट में, उनको फिर संक्रमण का है खतरा

People who have been infected with the corona virus are as safe against re-infection as those who have received the Kovid-19 vaccine. This has been revealed by a survey of 20 thousand British healthcare workers. It has been claimed to be the largest research in the world so far. Early discoveries by scientists at Public […]