Smallpox is the most deadly disease ever experienced by humans. It kill over thirty percent of people that got the disease. It could have wiped out the entire human race, but vaccines have been putting an end to its destruction. Vaccines have been stopping many other diseases, but now many people think that vaccines are becoming a problem. Some think that they may cause autism and that they don’t help them, and others, against the battle with diseases. People also want to know why they have to get vaccinated for diseases that aren’t even common anymore. Autism is a mental disease that was once thought to be caused by vaccines, but according to further evidence it has been proven not to. Although no one really knows what causes autism, many people think that vaccinating their children may put them in danger and cause them to develop autism. An ingredient that most think is the cause is thimerosal. Thimerosal has been proven not to and has a very safe record. The Institute of Medicine, or IOM, did a…show more content… Everyone needs to get vaccinated so a community will become immune. This is called herd immunity. Herd immunity is when many people in one community will either get vaccinated or have this certain disease and recover from it and this makes it so the bacteria will have a harder time finding people to infect. The vaccines part of the herd immunity works because vaccines put a sort of fake, dead disease into a person’s body. For example, when people get the smallpox vaccination, they put a dead version of the disease inside of them. Then their body makes Antibodies, made by white blood cells to fight infections, which tries to kill the already dead disease. After that the antibodies stay in the body until they get infected again. So when that person does get infected, they will not get sick because the antibodies would be fighting it off as soon as it go in their
