MADISON — The Wisconsin Department of Health Services (DHS) supports the recommendation that certain populations who have increased risk of exposure to or transmission of COVID-19 receive a booster shot of Pfizer-BioNTech’s (Pfizer) COVID-19 vaccine at least six months after having received their second dose of the Pfizer vaccine.

“Our nation’s leading medical experts reviewed the available data and recommended COVID-19 vaccine booster doses be provided to some people who have received the Pfizer vaccine,” said DHS Secretary-designee Karen Timberlake. “Booster doses are another tool at our disposal to stop the spread of the highly transmissible Delta variant and slow the spread of COVID-19 in communities throughout Wisconsin.”

At this time, the Pfizer booster authorization only applies to people whose primary series was Pfizer vaccine. People in the recommended groups who got the Moderna or Johnson & Johnson vaccine will likely need a booster shot in the near future. More data on the effectiveness and safety of Moderna and Johnson & Johnson booster shots are expected soon.

“Booster doses are intended to help people who are vaccinated maintain the highest possible level of immune system protection for as long as possible,” said Dr. Ryan Westergaard, Chief Medical Officer for the DHS Bureau of Communicable Diseases. “It’s important to remember that all the authorized COVID-19 vaccines offer strong protection after the primary series. Getting every eligible person vaccinated continues to be our most important strategy for preventing severe illness, hospitalization, and death.”

A booster dose serves a different purpose than the additional dose recommended in early August for certain immunocompromised people. The additional doses are for people with certain medical conditions or who are receiving certain treatments leaving them moderately or severely immunocompromised and who may not have built a strong enough immune response after their initial vaccine. In contrast, a “booster dose” refers to another dose of a vaccine that is given to someone who built enough protection after their initial vaccination, but then that protection decreased over time — also referred to as waning immunity. Evidence suggests that immunity is waning over time for some people who were initially well-protected by the vaccine. For those people, a booster dose will strengthen and extend their protection against infection, serious illness, hospitalization, and death from COVID-19.

With the high-level of disease transmission in Wisconsin, DHS continues to urge everyone who is not vaccinated to get the COVID-19 vaccine, and for all people to add additional layers of protection including masking up indoors, staying home when feeling sick, and avoiding large indoor gatherings.

For additional information about booster doses, additional doses, and help accessing your COVID-19 vaccine record to determine when you may be recommended for a booster, visit the DHS Additional Doses and Booster Doses webpage.

To find a COVID-19 vaccine provider in your community, visit vaccines.gov, or call 211 or 877-947-2211. For up-to-date information about Wisconsin’s COVID-19 response, visit the DHS COVID-19 webpage. You can also follow @DHSWI on Facebook, Twitter, or dhs.wi on Instagram for more information on COVID-19.