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-pfizer

US drug makers Pfizer and Moderna have, in different studie,s 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.

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

In preliminary results of the study shows that mixing of two Covid-19 vaccines may increase the side effects like fatigue and headaches.

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

Study shows what happens when you mix two Covid-19 vaccines