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Hep B8p
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2. Note to presenters: Images of vaccine-preventable diseases are available from the Immunization Action Coalition website at http://www.vaccineinformation.org/photos/index.asp
16. Age of Infection of Acute and Chronic Hepatitis B Virus Infection Acute infection Chronic infection CDC Sentinel Sites. 1989 data.
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18. Hepatitis B Virus Infection by Duration of High-Risk Behavior 0 3 6 9 12 15 Years at Risk 0 20 40 60 80 100 Percent infected IV drug user Homosexual men HCWs Heterosexual
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20. Hepatitis B Vaccine 1965 Discovery of Australian antigen 1973 Successful HBV infection of chimpanzees 1981 Licensure of plasma-derived vaccine 1986 Licensure of recombinant vaccine 1991 Universal infant vaccination 1996 Universal adolescent vaccination
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23. Protection* by Age Group and Dose * Anti-HBs antibody titer of 10 mIU/mL or higher ** Preterm infants less than 2 kg have been shown to respond to vaccination less often *** Factors that may lower vaccine response rates are age >40 years, male gender, smoking, obesity, and immune deficiency 90%-95% 98%-100% 3 75%-80% 80%-95% 2 20%-30% 16%-40% 1 Teens and Adults*** Infants** Dose
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Notas do Editor
Although HBV has numerous antigens, only the presence of HBsAg indicates active infection. Antibody to HBsAg, from either disease or vaccine, indicates immunity.
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The reduction of reported cases in the late 1990s is not likely due to vaccine. An estimated 100k infections continue to occur annually, primarily in young adults.
This graphic shows the distribution of risk factors in 2001. Persons with multiple sexual contacts, men who have sex with men, and sexual contact with a person known to have HBV infection account for 54 percent of cases with a known risk factor. Injection drug use accounts for 20 percent of cases. About 3 percent of cases are in people who have household contact with a person with acute or chronic hepatitis B. Fifteen years ago, health care workers accounted for 2 percent of HBV infections- 2 or 3 thousand new infections each year. Since that time, the rate of infection among health care workers has declined by 95 percent, and is now lower than the rate for the general population. Hepatitis B vaccine has made occupational HBV infection a thing of the past.
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In December 2002, the US Food and Drug Administration approved a new combination vaccine- Pediarix- which is manufactured by Glaxo Smith Kline. This vaccine contains DTaP, inactivated polio and hepatitis B vaccines. The DTaP component is Infanrix, and the hepatitis B component is Engerix-B, which were previously licensed in the U.S. Pediarix is approved for the first three doses of the DTAP and IPV series, which are usually given at about 2, 4, and 6 months of age. However, Pediarix is approved for use through 6 years of age. The minimum age for the first dose of Pediarix is 6 weeks. So it can’t be used for the birth dose of the hepatitis B series.
Interchangeable Can be used after a birth dose of heaptitis B – total of 4 doses O.K. Pediarix may be used in infants born to women who are hepatitis B surface antigen positive or whose hepatitis B status is unknown. Like COMVAX, Pediarix is not approved for this use. But at it’s February 2003 meeting, ACIP voted to allow the use of Pediarix to complete the hepatitis B series in these infants. But remember that the minimum age for Pediarix is 6 weeks, so it must NOT be used for the birth or one month dose of the hepatitis B series. Another important fact to remember about Pediarix is that the minimum intervals between doses are dictated by the single antigen with the longest minimum intervals. Therefore, Pediarix minimum intervals are determined by the hepatitis B component. As for hepatitis B vaccine, the minimum interval between the first two doses of Pediarix is 4 weeks. The third dose must be administered at least 8 weeks after the second dose, and should follow the first dose by at least 16 weeks. The third dose should not be given before 6 months of age to be counted as a valid third dose of hepatitis B vaccine.
![[object Object],Epidemiology and Prevention of Vaccine-Preventable Diseases National Immunization Program Centers for Disease Control and Prevention Revised December 2004](https://image.slidesharecdn.com/hep-b8p-091002100212-phpapp02/85/Hep-B8p-1-320.jpg)
