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Pfizer fourth booster vaccine: Three side effects to expect from fourth dose – new trial


However, the study authors said that adding the fourth dose for people inoculated and boostered with the Pfizer-BioNTech shot may only have “marginal benefits”.

They added: “Our cohort was too small to allow for accurate determination of vaccine efficacy.

“However, within the wide confidence intervals of our estimates, vaccine efficacy against symptomatic disease was 65 percent at most.”

It comes as coronavirus cases have surged across the country, with infections among over-70s reaching record highs.



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