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2nd try for answer

Jun 6, 2001

i have completed the second of the three stage hep b vaccination series. the third is due four months from now. i plan ontraveling where i will be sexually active within the next month. please tell me if i am now sufficiently protected or if i have any immunity whatsoever??? thank you

Response from Mr. Kull

The reason three doses of Hepatitis B virus vaccine are administered at specific intervals is to insure long-term immunity to vaccine recipients. The CDC states that, among young adults, 50% will have a protective level of Hepatitis B antibodies after the first dose, and 85% will have immunity after the second dose. However, it is not clear how long one might remain immune after receiving two doses. It is important that you receive the third dose of the vaccine series as close to the target date as possible to increase the likelihood of long-term immunity. And while you are sexually active, try to use condoms to decrease the likelihood of Hepatitis B virus infection.

Read through the "Sexually Transmitted Disease Basics" ( for more information on STD transmission and prevention.


Probability of infection?!
safe sex question that I think everyone wants to know

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