See below: Per usa's cdc recs, after receiving the primary 4 dose set of vaccinations, persons in the continuous risk category should be tested every 6 months and persons in the frequent risk category should be tested every 2 years and if the titer falls below a value of at least complete neutralization at a 1:5 dilution by rapid fluor focus inhib test, they should receive a booster. So, no perm resistance.
Answered 7/18/2013
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