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Vaccine Glossary

Vaccines: The Basics

Vaccines contain the same germs that cause disease. (For example, measles vaccine contains measles virus, and Hib vaccine contains Hib bacteria.) But they have been either killed or weakened to the point that they don’t make you sick. Some vaccines contain only a part of the disease germ.

A vaccine stimulates your immune system to produce antibodies, exactly like it would if you were exposed to the disease. After getting vaccinated, you develop immunity to that disease, without having to get the disease first.

This is what makes vaccines such powerful medicine. Unlike most medicines, which treat or cure diseases, vaccines prevent them. For more, visit the Centers for Disease Control website.

DTaP

Protects against three diseases:

  • Diphtheria can damage the heart, kidneys, and nerves. About one person in 10
    who gets diphtheria will die from it.
  • Tetanus (lockjaw) causes severe muscle spasms that make it hard to breathe.
    Tetanus happens when the tetanus bacteria infects a wound. About 6 people in
    10 who get tetanus will die from it.
  • Pertussis (whooping cough) causes severe coughing. It can also cause
    convulsions, brain damage, and death. Very young children are at the greatest
    risk of complications due to pertussis.

Tdap

Protection from the DTaP vaccines can fade over time. To keep immunity strong, adolescents and adults need booster vaccines. Tdap is used as a booster vaccine for adolescents and adults to protect against tetanus, diphtheria, and pertussis. Pertussis can cause death in infants up to 6 months old. For this reason, anyone who has regular contact with an infant younger than 6 months old should get a Tdap booster.

Hepatitis A

Protects against hepatitis A, which can cause severe liver problems.

Hepatitis B

Protects against hepatitis B, which can damage the liver, cause liver cancer, and lead to death.

Hib

Protects from Haemophilus influenzae type b, which causes severe infections of the brain, blood, joints, bones, skin, and throat. It most often affects children younger than 5 years old.

HPV

Protects against diseases caused by the specific genital human papillomaviruses (HPV) contained in the vaccine. These HPV viruses can cause genital warts, anal cancer, and precancers of the cervix, vulva, and vagina.

Influenza (flu)

Protect against yearly flu viruses, which spread quickly from person to person. The flu can be very serious, causing high fever, seizures, and diarrhea. It can also lead to more serious illnesses, such as pneumonia, and make chronic health problems worse.

IPV

Protects against polio, a severe crippling disease. About one person in 10 who gets polio will die from it.

MMR

Protects against three diseases:

  • Measles, which causes fever and rash. It also can cause convulsions, deafness, and blindness.
  • Mumps, which causes fever and swelling of glands in the throat. It also can
    cause deafness, brain damage, and sterility in males.
  • Rubella (German measles), which usually causes only a mild illness in children but is very easy to catch. If a pregnant woman gets infected with rubella, it can cause miscarriage or birth defects in her unborn child.

MCV

Protects against meningitis, which is an infection of the fluid surrounding the brain and spinal cord and causes blood infections.

PCV

Protects against infection from the pneumococcal bacteria, which can cause ear infections, meningitis, blood infections, and pneumonia. Pneumococcal infections can be serious and may lead to death.

Rotavirus

Protects against rotavirus, which causes severe diarrhea in infants and young children. It may also cause fever and vomiting. The vaccine is given in three doses orally (by mouth). The doses are recommended at 2, 4, and 6 months of age. The first dose should be given between 6 and 14 weeks of age. The series should be complete by 8 months of age.

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