In this case people can have a booster shot. This area is vague: some say immunity is for life, some say for 13 years, 20 years, etc.
I hv seen the level of anti-HB level dropped from 20+ to negative within 8 yrs (data from my friend).....my worry is the level continue to drop and the immunity level will weaken....
3 of my four children have positive anti-HBs, 1 is HBsAg negative and anti-HBs negative despite the fact he had all three shots 7 years ago. Per zellyf's advice, that child is getting his second 3 shots so that test for anti-HBs can be done 1-2 months after the third shot.
Understand yr kid also negative on anti-HB, hv they completed the vacc? Hv they measured the an-HB level?
>>>i) 3 kids currently go for 3 shots full vaccination - when will be the best time to measure the anti-HB level? Completed 1st shot 2 wks ago.
Measure it 1-2 months after the last shot.
>>>ii) 1 w/ 52 mIU/mML, dr suggeted no booster and safe. Should I send him for booster shot.
>10 mIU/mML is considered having antibody.