Quote:
Originally Posted by Emmeline II 
It is not an assault on your character; it is a stated reason for giving Hep B at birth. That the people most at risk (IV drug users and the promicuous) are the least likely to be available for vaccination; a teen is less likely to see a doctor (than a newborn) but more likely to engage in those behaviors. That it is "too much trouble" to test every mom, particularly those who come to the hospital with an unknown history, is also a reason giving for universal Hep B newborn dose.
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Also, the normal HBsAg test is not completely accurate (due to the low background of ELISA failures, occult infections, or HBV escape mutants). A false negative on a prenatal HBV test means that the infant may be saddled for life with HBV unless the vaccine is given (they may still get it if the mother is infected unless they get the HBIg too). More accurate tests exist, but again, it is cheaper to give the vaccine to everybody than to use these tests.
[The HBsAg test is known to be less accurate than those for other diseases - the risk of getting HBV from a blood transfusion is 1:600,000 whereas HCV/HIV risks are about 1:2,000,000]