New evidence has surfaced showing that Covid infection combined with vaccination provides best protection. Researchers termed this “hybrid immunity”, which is immunity against Covid-19 through a combination of Covid infection as well as vaccination. Researcher measured immunity 1 year
As the Delta variant is galloping through the US, the question comes up “are booster vaccines necessary for Covid-19 prevention”. The CDC ruled in the week of August 9, 2021 that immunocompromised people should receive a third dose of the Pfizer or Moderna vaccine. The Gamma globulin