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Hepatitis B Risk

I am a male. I had protected vaginal sex but not sure if condom was intact or not.
I took HBsAg (Australia Antigen) test after 6 months of exposure and it came as Non-Reactive.

1. Do I need more tests?
2. How much risk is there from single exposure?
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20620809 tn?1504362969
Having protected sex protected you.  You'd know if the condom broke as that is a noticeable event.  Condoms split wide open and people don't miss that.  Pin holes are a myth.  But regardless, yes, your test can be counted on.  It means you do not currently have hep B.   People can get a negative HBsAg result even if once positive for Hep B if they spontaneously cleared the virus.  So, whether or not you've 'ever' had it, I don't know.  but the result indicates you don't now and you won't now develop it from that episode 6 months ago.  
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https://www.hepb.org/prevention-and-diagnosis/diagnosis/understanding-your-test-results/  maybe that link will help you understand better.
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