Vaccines are one of the most effective methods of preventing and controlling certain communicable diseases.
The smallpox vaccine is not currently in use because the smallpox virus has been declared eradicated from the
world’s population. Diseases such as polio, diphtheria, pertussis, and measles are mostly controlled by routine
childhood immunization. They have not, however, been eradicated, so children need to be immunized against
these diseases.Physiological Adaptation
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