Can the first dose of vaccine make someone win against the covid virus?
in my country the government recommends all ages to receive the first and second doses of the vaccine. The administration of the first dose of vaccine and the second dose also takes a long time, maybe 1 - 2 months.
Well... for the original strain, even one dose of the vaccine could have given enough immunity to avoid hospitalization. But the emergence of the delta variant has changed the equations. Even two doses of the best vaccine (Moderna) is only 76% effective against this strain. For Pfizer, the efficacy drops to 42%. I would assume much lower efficacy for the other (i.e non mRNA) vaccines. That is the reason why many of the countries, which earlier used vaccines like Sinovac and AstraZeneca are going for the third (booster) shot.