After exposure: immune globulin 0.02 mL/kg IM within 2 weeks to household and institutional contacts (not casual contacts at work). Before exposure: inactivated HAV vaccine 1 mL IM (unit dose depends on formulation); half dose to children; repeat at 6-12 months; target travelers, military recruits, animal handlers, day-care personnel, laboratory workers, and pts with chronic liver disease (especially hepatitis C).