Explainer: Why people get infected even after vaccination?

The COVID-19 vaccination program is underway in India. India to enter the third phase of vaccination drive soon. However, some people in the country get re-infected with the virus after taking two doses of the vaccine. Such infections added hesitancy around vaccines. According to stats, only 2 to 4 people are getting infected per 10 thousand after taking vaccines. Watch the video to know more.