9 Jul 2021 - Pfizer plans to request US emergency authorisation in August for a third booster dose of its COVID-19 vaccine, based on early data showing that it can sharply increase immune protection against the coronavirus.

The company has received initial data from an early human study showing that a third dose of its existing coronavirus vaccine is safe and can raise neutralising antibody levels by 5 to 10 fold compared with the original vaccine, Pfizer research head Mikael Dolsten said in an interview.

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