ACIP	Advisory Committee on Immunization Practices
anti-HBc	Antibody to hepatitis B core antigen
anti-HBs	Hepatitis B surface antibodies
CDC	Centers for Disease Control and Prevention (United States)
CI	Confidence interval
D.Lgs.	Decreto Legislativo (Italian Legislative Decree)
HBIG	Hepatitis B immunoglobulin
HBsAg	Hepatitis B surface antigen
HBV	Hepatitis B virus
HCW	Healthcare worker
mIU/mL	Milli-international units per millilitre
NR	Not reported
NSI	Needlestick and sharps injury
PEP	Post-exposure prophylaxis
PY	Person-years
QALY	Quality-adjusted life year
RR	Relative risk
WHO	World Health Organization