Thanks stef2011. I've been told that the hep b vaccine can wear off over time and it's effectiveness and ability to last depends if the series was administered in the correct time frames. Apparently different people react to the vaccine in different ways as well (eg some don't build immunity as well as others)
I was just concerned as my levels were quite low and it was so long ago that I did the course, and I'm not sure the three injections were spaced correctly.
I more want to know that if the HbSurface antigen was negative at 1,4,5 and 11 wks whether this is enough time for it not to go positive.
The CDC 'range' for hbsag is 1-9 weeks, normally showing positive at 4 weeks, but I'm not sure if 9 wks is the latest possible.
Dr E Hook said in a couple of posts that 2 mths is long enough to allow to test positive for surface antigen, but in another one he said 3 mth test result is definitive.
you cant get hbv after being vaccinated even if hbsag goes very low, adults dont get chronic hbv even wthout vaccine (4% chronicity only)
just have 3 shots of hbv vaccine again