कोरोना वायरस क्या है।कोरोना वायरस के लक्षण।

HOT NEWS UPDATE: Coronaviruses are a group of viruses that cause diseases in mammals, including humans, and birds। In humans, the virus causes respiratory infections which are typically mild but, in rare cases, can be lethal. There are no vaccines or antiviral drugs that are approved for prevention or treatment।