The immune system fights germs, viruses and poisons that attack the body. It is composed of white blood cells and other warrior cells. We have all heard of AIDS and the harm it does to the immune system. Some chemicals and drugs can also weaken the immune system by damaging its specialized cells. When this occurs, the body is more vulnerable to diseases and infections.
Every job has certain hazards.
Even a writer can get a paper cut. This is more than eight times the number of people who die from job-related accidents. Many of these illnesses are caused by chemicals and other agents present in the workplace. Factories and scientific laboratories can contain poisonous chemicals, dyes and metals. Doctors and other health workers have to work with radiation.