A timeline of how long vaccine boosters take to build immunity, according to experts

“Detectable antibodies peak around two to three months after full immunization, and then begin to wane thereafter,” explains Shruti Gohil, M.D., associate medical director of epidemiology and infection prevention as well an [assistant] professor at the UCI School of Medicine. … Additional doses of the vaccine, then, will “revive your circulating antibody population sufficient to reduce your risk of infection,” Dr. Gohil adds.