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How long after your first HEP B Vacc shot will your HBsag turn POS? or will it take until the second shot to turn POS
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Vaccination is to turn HBsAB to positive, not HBsAg.  About 6 months.
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Is a  150 day HBsag NEG likely to change to POS?
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I don't think so.  Cajim is correct, the point of the vaccine is to give you the antibodies that recognize HBVsAg, that is it should make you HBVsAb positive (Hepatitis B Virus surface Antibody positive) and with a little luck that will prevent you ever becoming HBVsAg positive (Hepatitis B Virus s Antigen positive).
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So your I dont think so is for my second question?

Thanks
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hbsag has nothing to do with vaccine, the vaccine has no virus in it, you can only develop antibody not the virus
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Is a  150 day HBsag NEG likely to change to POS?
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Is a  150 day HBsag NEG likely to change to POS?
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Likeliness is low.
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