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Live Healthy: Disease & Prevention


Disease & Prevention

Vaccines (including the flu shot), STD/HIV testing, tuberculosis and hepatitis services, and diseases carried by mosquitoes and ticks.


Immunization Programs & Vaccines

Immunizations, also known as vaccines or shots, are one of the most important public health efforts to control disease spread in the world. The San Mateo County Immunization Program works with community members, parents, physicians and clinics, schools and child care centers, older adults and other health and social service organizations to ensure that immunizations are available for all. Newborns, babies, teens, pregnant women, adults and older adults need immunizations to stay healthy and protected from diseases, such as polio, whooping cough (pertussis), measles, hepatitis B and flu.


STD/HIV Clinics and Testing

The San Mateo County STD/HIV Program works to prevent STD/HIV infection and care for individuals and families affected by HIV in San Mateo County. The Program provides comprehensive, community-based prevention and testing services, STD/HIV related health care, social services, advocacy, and referrals to community agencies providing drug treatment, housing, food, dental care and other services.


What to Do About the Flu

To prevent a “twindemic” of COVID-19 and seasonal influenza, San Mateo County Health is urging everyone over the age of 6 months to get a flu shot to protect themselves and their loved ones. Flu vaccination is part of a comprehensive public health strategy not only to reduce the burden of flu but also to preserve health care resources for care of patients with COVID-19. It takes a couple of weeks after vaccination for the body to build an immunity, so it’s best not to delay getting a shot.

Older adults, pregnant women, young adults, children, and people with other underlying health conditions are most at risk of getting the flu, but everyone six months and older should get vaccinated.

It takes two weeks after being immunized to be fully protected. The vaccine only keeps you fully protected for about one year, so it’s important to get vaccinated every year.

You can get flu shots from:

  • Your primary health care provider
  • Retail pharmacies and stores, with information and appointments available on MyTurn 

Flu symptoms include fever, cough, sore throat, a runny or stuffy nose, muscle or body aches, headaches and fatigue. There are other viruses that can cause these symptoms, but a high fever and bad cough usually indicate flu.


Viral Hepatitis

The word “hepatitis” means inflammation of the liver. Hepatitis is most often caused by a virus.  In the US, the most common types of viral hepatitis are Hepatitis A, Hepatitis B, and Hepatitis C.

Viral hepatitis is the leading cause of liver cancer and the most common reason for liver transplantation. An estimated 4.4 million Americans are living with chronic (lifelong) hepatitis. Most do not know they are infected.


Lyme Disease & Tick Testing

The incidence of Lyme Disease in San Mateo County is very low.

There were 24 reported cases from 1991 to 1999, ranging from 1 to 4 cases each year. Compare this number to over 9,000 to 16,000 nationwide cases reported each year during the same time period.

Mpox information and guidance


In preparation for the summer season and Pride celebrations in the Bay Area, San Mateo County Health urges at-risk individuals to protect themselves against the mpox virus. County Health strongly encourages vaccination for those populations likely to be most impacted as mpox increases in the Bay Area. Read more here.