Preexposure HAV vaccination (see Adult Immunization Schedule) should be provided for adults with increased risk, including Travelers to countries with high or intermediate HAV endemicity Diagnostic laboratory workers Men who have sex with men People who use injection or noninjection illicit drugs People with chronic liver disorders (including chronic hepatitis C) because they have an increased risk of developing fulminant hepatitis due to HAV People who anticipate close contact with an international adoptee during the first 60 days after arrival from a country with high or intermediate HAV endemicity People who do not have stable housing or who are homeless Preexposure HAV prophylaxis can be considered for day-care center employees and for military personnel.