Scientific studies show that many different genes work together with things in the environment to put a child at risk for autism spectrum disorder (ASD). Scientific studies do not show that vaccines cause ASD.

(Please see the related Vaccine Information Statement, The Chickenpox Vaccine: What You Need to Know)

Chickenpox (also called varicella) is a common childhood disease. It is usually mild, but it can be serious, especially in young infants and adults.

Diphtheria, tetanus, and pertussis are serious diseases caused by bacteria. Diphtheria and pertussis are spread from person to person. Tetanus enters the body through cuts or wounds.

HPV vaccine prevents infection with human papillomavirus (HPV) types that are associated with many cancers.

(Please see the related Vaccine Information Statement, Haemophilus Influenzae Type b (Hib) Vaccine: What You Need to Know)

Haemophilus influenzae type b (Hib) disease is a serious disease caused by bacteria. It usually affects children under 5 years old. It can also affect adults with certain medical conditions.

Hepatitis A is a serious liver disease caused by the hepatitis A virus (HAV). HAV is found in the stool of people with hepatitis A.

Hepatitis B is a viral infection of the liver. It is caused by the hepatitis B virus (HBV). Lifelong HBV infection can lead to liver cancer or scarring of the liver (cirrhosis). More than 1 million people in the United States are living with

Hepatitis B is a serious infection that affects the liver. It is caused by the hepatitis B virus.

About 4 million Americans are infected with Hepatitis C virus (HCV), and many do not even know it. Anyone can get infected with HCV, including children.

Immunizations have helped children stay healthy for more than 50 years. They are safe and they work. In fact, serious side effects are no more common than those from other types of medication. Vaccinations have reduced the number of infections from vaccine-preventable diseases by more than 90%! Yet many

Influenza (“flu”) is a contagious disease that spreads around the United States every year, usually between October and May.

With any medicine, including vaccines, there is a chance of reactions. These are usually mild and go away on their own, but serious reactions are also possible.

Measles, mumps, and rubella are serious diseases. Before vaccines they were very common, especially among children.

Measles, mumps, rubella, and varicella are viral diseases that can have serious consequences. Before vaccines, these diseases were very common in the United States, especially among children. They are still common in many parts of the world.