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Hepatitis B vaccines
Jun 29, 2002

This questin is regarding hep b vaccine. What would happen if you were given the hep b vaccine shot, but you are positive? My cousin's doctor gave him the vaccine shot without knowing the results if he was negative/positive. He was given the first shot. He later learn he is positive, but he already had the vaccine shot. Can this hurt or harm him even more so? I was under the impression that you were given the vaccine shot if you are negative.

Response from Dr. Fried

I'm not sure what you are referring to as "positive". The HBV vaccine will not harm someone if they had a previous natural exposure and cleared it or if they had remained a chronic carrier of HBV (it would not help either). Pre-vaccination testing for HBV is not routinely recommended unless a high likelihood of previous HBV infection.

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