About the COVID-19 Vaccine

Several COVID-19 vaccines have been developed. Vaccines are made by different companies. Each may have some differences from the others. Pfizer-BioNTech has received full FDA approval for those age 16 and older. Pfizer for ages 12-15, Moderna, and Janssen (Johnson & Johnson) vaccines are authorized for emergency use in the United States. As the U.S. Food & Drug Administration meets and reviews other COVID-19 vaccines, the agency will provide updates on vaccines authorized for emergency use. When new details become available, Tuolumne County Public Health will update the information provided on this website.

The Centers for Disease Control and Prevention (CDC) has information about the vaccines undergoing large-scale trials. Most of the vaccines in these trials require two doses. The first shot starts building protection. A second shot 3-4 weeks later adds to the protection and provides maximum effectiveness.

If you tested positive for COVID-19 and recovered, you should still get the vaccine. While there is likely some immunity following recovery lasting at least a few weeks, it is unclear how long that immunity lasts and how much protection you get. The CDC recommends waiting 90 days after recovering from COVID-19 to be vaccinated. 

Any individuals in the community who have had a known COVID-19 exposure should not get vaccinated for COVID-19 until their quarantine period has ended to avoid potentially exposing healthcare professionals and other persons to the virus during their vaccination visit.

As the vaccines become available, you will still need to wear a mask and practice social distancing until enough people have been vaccinated and the virus gets under control. Vaccines have been shown to prevent infection. Studies are pending to see whether vaccines prevent spread of COVID-19.

See more CDC information about how the vaccine works.

Pfizer-BioNTech COVID-19 Vaccine Fact Sheets

Moderna COVID-19 Vaccine Fact Sheets

Janssen COVID-19 Vaccine Fact Sheets

 The Western States Scientific Safety Review Workgroup concluded the Johnson & Johnson vaccine is safe and effective and recommended resuming use of the vaccine for eligible Californians.


Vaccines go through large clinical trials before the U.S. Food and Drug Administration authorizes them to be given to the public. 

After being vaccinated, you may experience some side effects. This is a normal response and indicates that the vaccine is working. Read more about what to expect after being vaccinated and helpful tips

You cannot get COVID-19 from the vaccine because the vaccines are not made with active SARS-CoV-2 virus.

The CDC has more on vaccine safety, including its new v-safe tool created for COVID-19 vaccines.