KRT88P and hepatitis B virus infection: Twenty-one of the (10.0%) HCWs tested positive for current HBV infections (HBsAg positive, anti-HBc positive) (Table 2), nine (4.3%) were considered immune due to past infection (HBsAg negative and anti-HBc positive; anti-HBs positive), and nine (4.3%) participants were immune due to hepatitis B vaccination (only anti-HBs positive).