When we think about staying healthy, we usually think of a balanced diet, regular exercise, adequate sleep, reducing stress, and getting regular health checkups. But alongside these, immunization or getting vaccinated is also an essential part of preventive healthcare. Throughout the long history of human civilization, epidemics and infectious diseases have caused the premature deaths of millions of people. Humanity was once completely helpless in the face of deadly diseases like smallpox, polio, plague, tetanus, and measles. The single most successful innovation in medical science that brought modern humanity back to the light from that dark chapter is the vaccine…