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Vaccines Do Not Cause Autism. Autism spectrum disorder (ASD) is a developmental disability that is caused by differences in how the brain functions. People with ASD may communicate, interact, behave, and learn in different ways.
The cause of smallpox is an infection with the variola virus. This is a double-stranded DNA virus in the family Poxviridae and the genus Orthopoxvirus. Variola virus only infects humans. Thanks to the success of vaccination, the last natural outbreak of smallpox in the United States occurred in 1949. By 1972, routine smallpox vaccinations for children in the United States were no longer needed.