See the CDC website for more detail on COVID vaccines and boosters. Booster recommendations may differ for people who have a weakened immune system. You should wait at least two months after your previous booster or primary vaccine series to get the new booster. The bivalent shots target both the original COVID strain and the two most recent Omicron subvariants (BA.4 and BA.5), which are more contagious than earlier strains. The CDC is urging all adults to also stay up to date with COVID vaccines, including the new bivalent mRNA booster. But get the standard flu vaccine if none of the other options are readily available. People who fall into the other high-risk categories mentioned above might also want to seek out one of these vaccines, says Dr. The third contains an adjuvant, which is an additive that enhances immune response. The first two contain higher amounts of antigens, the proteins that trigger the body's antibody response. If you're over 65, the CDC recommends getting one of the vaccines that produces higher levels of antibodies that help protect you against the flu: the Fluzone High-Dose Quadrivalent, Flublock Quadrivalent recombinant, or the Fluad Quadrivalent adjuvanted vaccines.
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