Dr Randeep Guleria, former director of All India Institute of Medical Sciences (AIIMS), said, “Currently we are witnessing an increase in the number of influenza cases, which basically have fever, sore throat, cough. , body ache and runny nose and it is a type of influenza virus. Which we see every year during this time, but this virus changes itself with time. It mutates over time and is what we call antigenic drift. Along with this, he has advised to wash hands frequently and apply mask in crowded places for precaution.