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NOTE: The Centers for Disease Control and Prevention (CDC) provides thorough, up-to-date information on vaccines. The Immunization Action Coalition is also a reliable resource.

Immunization No. of injections Protection period Exposure More information

Hemophilus influenza type B (HIB)

Variable Lifetime Respiratory

CDC information

Hepatitis A

2 injections 20+ years Contaminated food and water CDC information

Hepatitis B

3 injections Lifelong Blood and bodily fluids What You Need to Know About Hepatitis B (Hall Health Center)

Hepatitis A/B combination

3 injections 20+ years to lifelong Blood and bodily fluids

CDC information (A)

CDC information (B)

Human Papillomavirus (HPV) 3 injections Lifelong Skin to skin

HPV Vaccine FAQs (Hall Health Center)

All About HPV     (Hall Health Center)

Influenza 1 injection or nasal spray 1 year Respiratory virus CDC information
Japanese encephalitis 2 injections 1-2 years Mosquito CDC information
Meningococcal 1 injections 3-5 years Respiratory CDC information
Measles, Mumps, and Rubella (MMR) combination 2 injections Lifelong Respiratory

CDC information

Polio (IPV) Childhood series + 1 injection as an adult Lifelong Contaminated food and water CDC information
Pneumococcal 1 injection or childhood series 10+ years Respiratory CDC information
Rabies 3 injections Partial protection Mammal exposure: bite, scratch CDC information
Tetanus, Diphtheria, and Pertussus combination TD or TDaP
Dtap (children)
Approximately 10 years Infected wound, respiratory CDC information
Typhoid 1 injection OR oral pills

2 years for injection;
5 years for oral tablets

Contaminated food and water CDC information
Varicella (chicken pox) 2 injections Lifelong Respiratory CDC information
Yellow Fever 1 injection 10 years Mosquito CDC information
Herpes Zoster (shingles) 1 injections Lifelong Previous chicken pox CDC information