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Immunizations - Hepatitis A

Description

An in-depth report on the purpose of immunizations and recommended schedules.

Alternative Names

Measles; Rubella; Tetanus; Vaccinations; Whooping cough

Hepatitis A:

The hepatitis A virus infected an estimated 56,000 people in 2004. Hepatitis A, formerly called infectious hepatitis, is always acute and never becomes chronic. The virus is excreted in feces and transmitted by contaminated food and water. Eating shellfish taken from sewage-contaminated water is a common means of contracting hepatitis A. It can also be acquired by close contact with individuals infected with the virus. It is estimated that 11 - 16% of reported cases occur among children or employees in daycare centers or among their contacts. The hepatitis A virus does not directly kill liver cells, and experts do not yet know how the virus actually injures the liver.

A fly may act as a mechanical vector of diseases such as hepatitis A. The fly may carry the infective organism on its feet or mouth parts and contaminate food or water, which a person then consumes. A biological vector actually develops an infective organism in its body and passes it along to its host, usually through its saliva. A fly can be a biological vector, as in the transmission of leishmaniasis by the sandfly.

Vaccines for Hepatitis A

All children should get 2 doses of the hepatitis A vaccine starting at 1 year, according to CDC recommendations. The doses should be given at least 6 months apart. Others who should be vaccinated against hepatitis A include travelers to developing countries, people living in communities where outbreaks occur, people with blood-clotting disorders, sexually active homosexual men, and health care workers exposed to the virus. People with chronic liver disease, including those with hepatitis C, should also be vaccinated, particularly if they have not been exposed to hepatitis A, since the infection can cause liver failure in these patients.

The hepatitis A vaccine can be given along with immune globulin and other vaccines. Individuals should also receive immune globulin if they are exposed within 4 weeks of the vaccination. A combined vaccine against both hepatitis A and B is now available as well for those at high risk for both these infections. People should get 3 doses of this vaccine, and the last dose should be given 6 months after the first dose.

Side Effects. The vaccine is very safe and effective, although allergies can occur. The most common side effects reported are soreness at the injection site, headache, and general malaise.

Click the icon to see an image about hepatitis A immunization.

Resources

www.immunize.org -- Immunization Action Coalition
www.cdc.gov/vaccines/ -- The National Immunization Program
www.fda.gov/cber/vaers/vaers.htm -- Vaccine Adverse Event Reporting System
www.hrsa.gov/vaccinecompensation/ -- National Vaccine Injury Compensation Program
www.immunizationinfo.org -- The National Network for Immunization Information
www.vaccine.chop.edu -- Vaccine Education Center, Children's Hospital of Philadelphia
www.vaccinesafety.edu -- Institute for Vaccine Safety, Johns Hopkins School of Public Health
www.whathealth.com -- National Partnership for Immunization
www.immunofacts.com -- Information on vaccinations
www.vaccines.org -- The Vaccine Page

References

American Academy of Pediatrics Committee on Infectious Diseases. Prevention and control of meningococcal disease: recommendations for use of meningococcal vaccines in pediatric patients. Pediatrics. 2005 Aug;116(2):496-505.

Centers for Disease Control and Prevention. Recommended Immunization Schedule for Ages 0 - 6 Years, United States, 2009.

Centers for Disease Control and Prevention. Recommended Immunization Schedule for Ages 7 - 18 Years, United States, 2009.

Centers for Disease Control and Prevention. Recommended Immunization Schedule for Adults, United States, 2009. Available online.

Centers for Disease Control and Prevention. Revised Recommendations of the Advisory Committee on Immunization Practices to Vaccinate All Persons Aged 11 - 18 Years with Meningococcal Conjugate Vaccine. Morbidity and Mortality Weekly Report. 2007:56(31);794-795.

Centers for Disease Control and Prevention. Notice to Readers: Recommendation from the Advisory Committee on Immunization Practices (ACIP) for Use of Quadrivalent Meningococcal Conjugate Vaccine (MCV4) in Children Aged 2 - 10 Years at Increased Risk for Invasive Meningococcal Disease. Morbidity and Mortality Weekly Report. 2007;56(48);1265-1266.

Centers for Disease Control and Prevention. Prevention of influenza: Recommendations of the Advisory Committee on Immunization Practices (ACIP), 2008. Morbidity and Mortality Weekly Report. 2008:57(No. RR-7).

Centers for Disease Control and Prevention. Update on Hib Vaccine Shortage. October 22, 2008. Available online.

Chaves SS, Gargiullo P, Zhang JX, Civen R, Guris D, Mascola L. Loss of vaccine-induced immunity to varicella over time. NEJM. March 15, 2007;356:1121-1129.

Garland SM, Hernandez-Avila M, Wheeler CM, Perez G, Harper DM, Leodolter S, et al. Quadrivalent vaccine against human papillomavirus to prevent anogenital diseases. NEJM. May 10, 2007;356:1928-1943.

GlaxoSmithKline. Boostrix Prescribing Information. December, 2008.

Grijalva CG, Nuorti JP, Arbogast PG, Martin SW, Edwards KM, Griffin MR. Decline in pneumonia admissions after routine childhood immunisation with pneumococcal conjugate vaccine in the USA: a time-series analysis. Lancet. April 7, 2007;369:1179-1186.

Poehling KA, Szilagyi PG, Crijalva CG, Martin SW, LaFleur B, Mitchel E, et al. Reduction of frequent otitis media and pressure-equalizing tube insertions in children after introduction of pneumococcal conjugate vaccine. Pediatrics. April 4, 2007;119:707-715.

US Food and Drug Administration. FDA Approves Expanded Uses for Gardasil to Include Preventing Certain Vulvar and Vaginal Cancers. September 12, 2008.

US Food and Drug Administration. FDA Approves New Vaccine to Prevent Gastroenteritis Caused by Rotavirus. April 3, 2008.

US Food and Drug Administration. Zostavax Questions and Answers. Available online. Last Accessed 3/12/2009.

World Health Organization. Immunization surveillance, assessment and monitoring -- United States of America (the) reported cases. Last Updated: December 18, 2008. Available online.

Zuckerman JN. Protective efficacy, immunotherapeutic potential, and safety of hepatitis B vaccines. J Med Virol. 2006 Feb;78(2):169-77.

Reviewed last on: 3/23/2009
Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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