Covid vax protection wane over time, boosters important: Pfizer, Moderna

Protection from mRNA vaccine against Covid-19 can last only for about six months, or a little more, claimed US drug makers Pfizer and Moderna.

Vaccine Booster Dose

US drug makers Pfizer and Moderna have, in different studies, claimed that protection from their mRNA vaccine against Covid-19 can last only for about six months, or a little more, pitching a strong case for booster shots -- ignoring the calls against it by a slew of scientists.