#boosterdose #protectivedose #COVID19 #HumSaathHai #dblsocialwelfarefoundation #physiodeptghmc Are booster shots actually necessary? A booster is an additional dose of vaccine that can help prolong protective immunity in someone who responded fully at first, but there's evidence that protection is declining after some time. "In essence, it's a 'top-up' of a person's antibody-mediated immune response to the first vaccine series," says Dr. Sostman. "Circulating antibodie