Incidences of diseases such as bacterial meningitis, measles, rubella, mumps, and chicken pox have been nearly eradicated, due to:

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Immunizations have greatly reduced the incidence of these diseases. Vaccines stimulate the body's immune system to produce antibodies that fight against specific disease-causing organisms. Through widespread immunization programs, many people have developed immunity to these diseases, making it more difficult for them to spread. Socialized healthcare and improved nutrition and sanitation can also contribute to the prevention of disease, but immunizations have played a major role in nearly eradicating these diseases. Natural selection does not play a role in the eradication of these diseases as they are not evolutionary pressures on humans.

Incidences of Diseases Such as Bacterial Meningitis, Measles, Rubella, Mumps