RESULTS	Person-year infection rates of HB virus were 8.9 % ( 8/89 .9 person-years ) for intradermal revaccinees , significantly higher than 3.6 % ( 12/337 .2 person-years ) in controls , and 4.3 % ( 3/70 .2 person-years ) for intramuscular revaccinees , approximating to that of controls , based on positive conversion of anti-HBc .\