Vaccines for active immunization are administered to essentially well individuals. In many cases this can be a somewhat subjective decision. Minor illnesses such as colds are usually not a ...

The primary response when a microorganism enters the body is described as natural active immunity. Vaccines close vaccineA substance that stimulates the body to produce antibodies to provide ...

Measles was declared eliminated in the United States in 2000, but clusters of cases have begun popping up across the country. The latest: A recent outbreak in Texas and New Mexico is nearing 100 cases ...