Pfizer vaccine trial bets on early win against coronavirus, documents show

FILE PHOTO: A man walks past a sign outside Pfizer Headquarters in the Manhattan borough of New York City, New York, U.S., July 22, 2020. REUTERS/Carlo Allegri

(Reuters) - Pfizer Inc is betting that its coronavirus vaccine candidate will show clear evidence of effectiveness early in its clinical trial, according to the company and internal documents reviewed by Reuters that describe how the trial is being run.

In recent weeks, Pfizer has said it should know by the end of October whether the vaccine, developed together with Germany's BioNTech SE<22UAy.F>, is safe and effective. If the vaccine is shown to work by then, Pfizer has said it would quickly seek regulatory approval. It has not said what data it would use.