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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.
Routine smallpox vaccinations stopped in the U.S. and in many other countries in 1972, and in all other World Health Organization member countries by 1986. Many adults living today likely got the vaccine as children. What Causes Smallpox? The variola virus causes it. There are two forms of the virus. The more dangerous form, variola major, led to smallpox disease that killed about 30% of people who were infected. Variola minor caused a less deadly type that killed about 1% of those who got it. How Smallpox Is Spread. The disease is highly contagious.