甲型肝炎
Beginning in November 2016, San Diego had one of the nation's largest Hepatitis A epidemics. From 2016 to 2018, Hepatitis A caused at least twenty deaths in San Diego County, with 589 reported cases of infection. Of those cases, 291 (49%) were in people experiencing homelessness (PEH). On October 24, 2018, the Center for Disease Control's Advisory Committee on Immunization Practices (ACIP) recommended that all persons aged 1 year and older experiencing homelessness be routinely immunized against HAV.