The Centers for Disease Control and Prevention has endorsed the Advisory Committee on Immunization Practices recommendation for a booster shot of Moderna and Johnson & Johnson COVID-19 vaccines for certain populations following the FDA amendment of emergency use authorizations. For individuals who received a Pfizer-BioNTech or Moderna COVID-19 vaccine, the following groups are eligible for a booster shot at six months after the initial series: age 65 years and older; 18 and older who live in long-term care settings; 18 and over who have underlying medical conditions; and 18 and older who work or live in high-risk settings. For individuals who received the Johnson & Johnson COVID-19 vaccine, booster shots are recommended for those 18 and older who were vaccinated two or more months ago. The CDC has also approved heterologous booster dosing — eligible people may choose a different booster from the vaccine they originally received. Additional information is available in the CDC media statement released following the ACIP meeting on Oct. 21.