UC Davis Health is vaccinating ages 12 and older

We're offering COVID-19 vaccines (first, second, and third doses) to anyone age 12 and older. Please use MyUCDavisHealth or California’s MyTurn.ca.gov to schedule your vaccine appointment.

UC Davis Health patients and non-patients can schedule appointments at our clinics in Auburn, Carmichael, Davis, Elk Grove, Folsom, Rancho Cordova, Rocklin, Roseville, and Sacramento.

COVID-19 vaccine boosters and third doses are recommended for certain groups of people. UC Davis Health is now offering additional doses for those eligible populations. Here's what you need to know from our UC Davis Health experts:

On Aug. 12, the U.S. Food and Drug Administration (FDA) authorized a third COVID-19 vaccine dose of Pfizer and Moderna for immunocompromised people age 12 and older. According to recommendations from the U.S. Centers for Disease Control and Prevention (CDC) for immunocompromised patients, the third dose must be given at least four weeks after the second dose.

Some of the conditions and treatments that result in immunosuppression include, but are not limited to, the following:

  • Active treatment for solid tumor and hematologic malignancies
  • Receipt of solid-organ transplant and taking immunosuppressive therapy
  • Receipt of chimeric antigen receptor (CAR)-T-cell or hematopoietic stem cell transplant (within 2 years of transplantation or taking immunosuppression therapy)
  • Moderate or severe primary immunodeficiency (e.g., DiGeorge syndrome, Wiskott-Aldrich syndrome)
  • Advanced or untreated HIV infection
  • Active treatment with high-dose corticosteroids (i.e., ≥20 mg prednisone or equivalent per day when administered for ≥2 weeks), alkylating agents, antimetabolites, transplant-related immunosuppressive drugs, cancer chemotherapeutic agents classified as severely immunosuppressive, tumor-necrosis factor (TNF) blockers, and other biologic agents that are immunosuppressive or immunomodulatory.

Additionally, the FDA and CDC recommend a Pfizer booster dose at least 6 months after the initial two doses of Pfizer for:

  • people age 65 and older
  • residents of a long-term care facility
  • people ages 18 to 64 deemed "high risk" of severe COVID-19 infection. This includes people with underlying medical conditions.
  • people who may have increased exposure to the virus because of their jobs, such as health care workers, first responders and educators.

Boosters for people who received two doses of Moderna or a single dose of Johnson & Johnson vaccine have not been approved at this time, but may be in the future.

People with compromised immune systems: The CDC recommends that “people with moderately to severely compromised immune systems receive an additional dose of mRNA COVID-19 vaccine at least 28 days after a second dose” of Pfizer or Moderna COVID-19 vaccine.

People age 65 and older: Pfizer-only booster shots should be given six months after the second COVID-19 vaccine.

People age 18-64 with an underlying health condition: Pfizer-only booster shots should be given six months after the second COVID-19 vaccine.

People who work in a high-risk job: Pfizer-only booster shots should be given six months after the second COVID-19 vaccine.

General public: An FDA panel rejected COVID-19 booster shots for the general public due to insufficient data, according to the FDA.

Unless you have a compromised immune system, boosters are only available for people who received initial doses of the COVID-19 vaccine from Pfizer.

If you are eligible for a COVID-19 vaccine or third dose, UC Davis Health patients and non-patients can schedule an appointment at MyUCDavisHealth. You can also use California's MyTurn.ca.gov vaccine scheduling portal.

Here are instructions to schedule your COVID-19 booster vaccination with one of our UC Davis Health locations:

  • Log into your MyUCDavisHealth account (on desktop or mobile)
  • Click "Visits" at the top
  • Click "Schedule an Appointment"
  • Scroll down and click COVID Vaccination (at the bottom on mobile or on the bottom right for desktop users)
  • Fill in the questionnaire, which will best guide you to the appropriate scheduling options.

As of Sept. 24, UC Davis Health employees who received two doses of the Pfizer COVID-19 vaccine more than six months ago are eligible for a Pfizer booster shot. The Employee Health Clinic will begin offering the Pfizer booster shots on Sept. 28. The clinic is already administering the flu vaccine for employees as well. The clinic is open Tuesday-Thursday from 7:30 a.m. to 5 p.m. and Friday from 7:30 a.m. to 10 p.m. It is closed on Mondays, weekends, and holidays. Walk-ins are welcome. Appointments are not necessary.

At this time, employees who received two doses of the Moderna COVID-19 vaccine are not eligible for the Pfizer booster unless they are immunocompromised. We hope to receive more information about the Moderna booster and its availability within the next month. According to CDC data, the Moderna vaccine is 94.1% effective at preventing laboratory-confirmed COVID-19 infection in people who received two doses and had no evidence of being previously infected. We will share any updates regarding the Moderna booster as they become available.

Please contact Employee Health at hs-employee.health@ucdavis.edu or 916-734-3572 if you have any questions about the Pfizer booster shot or the flu vaccine. 

Immunocompromised people are more likely to get severely ill from COVID-19. They are at higher risk for:

  • prolonged SARS-CoV-2 infection and shedding
  • viral evolution during infection and treatment
  • low antibody titers to SARS-CoV-2 variants

They are also more likely to transmit COVID-19 to people who live with them, and more likely to have breakthrough infection after immunization. More than 40% of hospitalized breakthrough cases are immunocompromised people.

In addition, people age 65 and older, those with underlying health conditions and people who work in a high-risk environment are at higher risk of contracting COVID-19.

Side effects following the third COVID-19 vaccine are similar to side effects following the second dose, with slightly more pain at the injection site, fever, chills, and fatigue. No serious side effects were found in third dose studies.

Health experts recommend sticking with the same mRNA vaccine (either Pfizer or Moderna) that you received for the first two shots. However, the CDC notes that switching between brands is safe and allowed if necessary. UC Davis Health plans to match previous vaccine doses with the booster shot.

At this time, only Pfizer and Moderna third doses are authorized for immunocompromised people. Otherwise, only Pfizer booster doses have been approved for the additional groups listed above. If you are among the few people who received a Moderna vaccine and then a Pfizer vaccine, a third dose of Pfizer vaccine is recommended.

The CDC noted that there may be booster shots recommended for people who received Moderna Johnson & Johnson vaccines. Researchers are still examining more data, which should be available in the next few weeks.

Patients who only received the Moderna vaccine are not eligible for boosters, unless you have a compromised immune system, according to the CDC criteria. This is because the Moderna vaccine seems to be more effective against the main coronavirus strain that is spreading throughout the U.S., known as the Delta variant. According to CDC data, the Moderna vaccine is 94.1% effective at preventing laboratory-confirmed COVID-19 infection in people who received two doses and had no evidence of being previously infected.

Experts don’t know yet how often additional COVID-19 vaccine doses will be needed. Data is needed to see how protection varies by specific vaccine and in different populations. This is likely to evolve as the pandemic evolves and may be impacted by the development of new variants.

It was understood that COVID-19 vaccines would not protect people forever. Although some vaccine manufacturers have publicly stated that they believe boosters are needed due to declining protection, there is very little data at this time that shows decreasing protection. So far, protection appears to be durable.

According to CDC data, the Moderna vaccine is 94.1% effective at preventing laboratory-confirmed COVID-19 infection in people who received two doses and had no evidence of being previously infected.

While the vaccines' effectiveness at preventing symptoms and illness declines over time as the body processes its immune response, all of the vaccines are still highly effective against hospitalization and death. These third doses of vaccine are aimed largely at preventing illness and reducing spread during the shorter time a vaccinated person may be ill. However, the initial two-dose series is still highly effective at preventing serious infections leading to hospitalization or death.