If we have vaccined against diseases like chicken pox etc then why does these disese occur?
In spite of having vaccines for various diseases like chicken pox, we commonly observe them in our community. This is so because not all people get proper vaccination for all the diseases. Chicken pox infection occurs ones in a person's lifetime as the body gets immunized after first exposure. Also the infection is self healing and it stays for about 7-10 days. So, most of the individuals in our surroundings have experienced it. But with increasing awareness about vaccines, people are getting their kids vaccinated. So, in near future, the diseases for which vaccines are available will not occur that frequently.