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(FILES) In this file photo a sign for Pfizer pharmaceutical company is seen on a building in Cambridge, Massachusetts, on March 18, 2017. - Pfizer said on September 27, 2021 it had begun a middle-to-late stage clinical trial of a pill to stave off Covid in people who are exposed to infection. Several companies are working on so-called oral antivirals, which would mimic what the drug Tamiflu does for influenza and prevent the disease from progressing to severe. (Photo by DOMINICK REUTER / AFP)
(FILES) In this file photo a sign for Pfizer pharmaceutical company is seen on a building in Cambridge, Massachusetts, on March 18, 2017. - Pfizer said on September 27, 2021 it had begun a middle-to-late stage clinical trial of a pill to stave off Covid in people who are exposed to infection. Several companies are working on so-called oral antivirals, which would mimic what the drug Tamiflu does for influenza and prevent the disease from progressing to severe. (Photo by DOMINICK REUTER / AFP)
/ DOMINICK REUTER
Por Agencia AFP

Pfizer informó el lunes de que había iniciado los primeros ensayos en humanos de una vacuna contra la gripe con tecnología de ARN mensajero, ya utilizada en su vacuna COVID-19.

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