Many millions of people have now been vaccinated against COVID-19.
The COVID-19 vaccines are highly effective but the next important question is how long would the vaccines continue to protect.
Some vaccines for other viral diseases offer life long protection but others like flu vaccines need annual boosters. COVID-19 Studies are still ongoing.
A recently released Pfizer vaccine study data indicates that protection with Pfizer vaccine lasts for many months as a minimum. To be precise, so far, Pfizer vaccine was found to have 91% efficacy for up to six months. Ongoing studies would clarify whether booster vaccines are needed in future.
Guardian. Pfizer vaccine has 91% efficacy for up to six months, trial shows. Ian Sample Science editor
Thu 1 Apr 2021 17.27 BST
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