What is a vaccine?
Vaccines are drugs that bolster the body's immunity to particular diseases. They work by imitating — but not causing — an illness in a way that forces the body to develop a supply of defensive cells. These cells can then recognize and fight off a future infection, should it occur.
Vaccines have eliminated some of the most dangerous, fatal diseases in human history. The World Health Organization in 1979 declared smallpox globally eradicated, and the Centers for Disease Control and Prevention (CDC) that same year proclaimed polio eradicated in the United States. Other vaccines have managed to push various diseases to the brink of extinction, including tetanus and whooping cough.
The scientific community widely supports vaccines, seeing them as one of the most crucial medical breakthroughs of the past few centuries.
And many countries use vaccination, thereby reducing the overall incidence rates. For example, look at the Russians. They are healthy like bears. They use the compulsory vaccination