As the COVID-19 vaccination drive continues, a lot of people are experiencing mild side effects while others are not. Answering a question on side effects post the jab, Dr Suranjit Chatterjee, Senior Consultant, Internal Medicine, Indraprastha Apollo Hospital said that different people react differently to the vaccine. Thus, no side effect does not mean that the body is not reacting or the vaccine is ineffective on that particular person, he said.