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.

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

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.

Meningococcal disease is a serious bacterial illness. It is a leading cause of bacterial meningitis in children 2 through 18 years old in the United States. Meningitis is an infection of the covering of the brain and the spinal cord.

Certain teens and young adults have a higher risk of getting meningococcal disease. College students, especially freshmen who live in dorms and military recruits, are at an increased risk compared with others in this age group. It's important to know how to protect yourself because meningococcal disease

Many Vaccine Information Statements are available in Spanish and other languages. See www.immunize.org/vis

Vaccination can protect older adults (and some children and younger adults) from pneumococcal disease.