Moderna vaccine recipients: A single booster dose is recommended for certain populations at least six months after the second dose:Moderna booster doses are half of an initial dose.Johnson & Johnson vaccine recipients: A single booster dose is recommended for all Johnson & Johnson recipients at least two months after the first dose.
Johnson & Johnson recipients can also elect to receive a single booster dose of the Pfizer or Moderna vaccines.Mixing and matching of all U.S.-approved COVID-19 vaccines is allowed.
Interchangeability of shots will provide additional flexibility. All vaccines are effective in reducing the risk of severe disease, hospitalization and death, even against the Delta variant.First and second doses will continue to be.