Search the site
San Francisco Victorian HousesGrandad and Baby image

We prevent the spread of disease in San Francisco by investigating cases and outbreaks, promoting vaccination, and planning for infectious disease emergencies.

Learn more about what we do.

Preventing a Hepatitis A Outbreak in San Francisco  


San Diego, Santa Cruz, and Los Angeles counties are currently having outbreaks of hepatitis A infection, primarily among homeless persons and/or users of injection and non-injection drugs. Cases with the same strain of hepatitis A infection have begun to appear in other California counties.  There have been no cases of hepatitis A this year among these same populations in San Francisco.

To prevent an outbreak in San Francisco, the SF Department of Public Health is working with key health care partners throughout the city to enable hepatitis A vaccination of those at highest risk.   

Health care facilities and providers should offer hepatitis A vaccine to all at-risk patients who are not known to be immune or to have completed a series with hepatitis A or hepatitis A/B vaccine.  Screening for serological immunity prior to vaccination is not necessary.  Vaccination consists of 2 doses of hepatitis A vaccine given at least 6 months apart.  The first dose rapidly protects about 98 out of 100 persons and the second dose ensures lifetime protection. A combination hepatitis A/B vaccine is also available; at least 3 doses are required; the first dose is not as protective but this difference disappears once the full series is completed. 

Persons seeking hepatitis A vaccination should visit their regular provider, or visit our SF Hepatitis A Outbreak Prevention page or dial 311 to learn the location and hours of SF clinics where they are welcome to drop in and receive free hepatitis A vaccine.



Zika Virus Information

mosquito on skin

Zika is an infectious disease caused by the Zika virus. It is most commonly transmitted to people by mosquito bites. Symptoms of Zika typically include fever, rash, joint pain, and/or red eyes. Zika is currently circulating in countries in Latin America and the Caribbean, as well as Puerto Rico. It is not circulating in the continental United States. In response to concerns regarding a potential role of Zika virus in causing birth defects, the Centers for Disease Control and Prevention (CDC) has issued a travel alert for people traveling to regions and certain countries where Zika virus transmission is ongoing.

For more information about Zika, visit our Zika Virus Information Webpage.

CDC Zika Testing Recommendations and Timeframe to Wait Before Trying to Conceive by Geographic Location.

Medical providers:

  • Read SFDPH Health Alerts for Zika Virus   
    • SFDPH Health Advisory: Zika Virus, dated March 29, 2017
    • SFDPH Health Update: Zika Virus, dated September 20, 2016
    • SFDPH Updated Health Advisory: Zika Virus, dated July 28, 2016
    • SFDPH Updated Health Advisory: Zika Virus, dated March 31, 2016
    • SFDPH Updated Health Advisory: Zika Virus, dated March 8, 2016
    • SFDPH Updated Health Advisory: Zika Virus, dated February 12, 2016
    • SFDPH Health Advisory for Zika Virus, dated January 22, 2016
  • Visit the SFDPH Zika Page for Healthcare Providers


Meningococcal Vaccination for Gay and Bisexual Men


Outbreaks of meningitis have occurred among gay men in some US cities.

Immunization can prevent brain, lung, and blood infection due to meningococcal bacteria (Neisseria meningitidis).

In addition to routine national recommendations for meningococcal vaccination ( the San Francisco Department of Public Health recommends that the following groups of people get immunized with the 4-strain meningococcal vaccine (MenACWY):

  • Gay, bisexual, and other men who have sex with men
  • Trans men and women who have sex with men
  • Female sex partners of men who have sex with men

Visit our Meningococcal Vaccination 2017 page to learn where you can get vaccinated with the 4-strain meningococcal vaccine.

To learn more about meningitis and how to prevent it, visit our Meningococcal Disease page. 




© Copyright 1998 - 2017, Department of Public Health, City and County of San Francisco Privacy Policy|Sitemap|Contact Us