it is not 100% there are about 7% of cronic hbv made of hbsag mutant with no hbsag and cronic hbv or made by hbsag positive and hbsab positive and there are also cronic hbv with no hbsag, no hbcab and only hbeag.so only the pcr dna and rna can say free 100%
and finally you also have rare occult hbv, again made by hbsag mutants.these mutants are getting spread more than in the past due to the use of the weak stupid antivirals lamivudine and adefovir, so in asia there are many natural hbsag mutants and many made by antivirals.
also vaccines or previous cleared hbv infection do not protect from the hbsag mutated forms
you can be almost 99,9% sure about eradication of both viruses if he had hbv and hcv at different time and cleared separately but gaian i'd prefer closest to 100% security by the hi sensibility pcr tests
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