Late­stage vac­cine study be­gins in U.S.

San Francisco Chronicle Late Edition - - FROM THE COVER -

John­son & John­son is be­gin­ning a huge fi­nal study to try to prove whether a sin­gle­dose COVID­19 vac­cine can pro­tect against the virus.

The study start­ing Wed­nes­day will be one of the largest coronaviru­s vac­cine stud­ies so far, test­ing in 60,000 vol­un­teers in the U.S., South Africa, Ar­gentina, Brazil, Chile, Colombia, Mex­ico and Peru.

A hand­ful of other vac­cines in the U.S. — in­clud­ing shots made by Moderna Inc. and Pfizer Inc. — and oth­ers in other coun­tries are al­ready in fi­nal­stage test­ing. Hopes are high that an­swers about at least one can­di­date be­ing tested in the U.S. could come by year’s end, maybe sooner.

Dr. An­thony Fauci says by the end of this year gov­ern­ment sci­en­tists should know whether they have a safe and ef­fec­tive vac­cine.

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