FILE PHOTO: Vial and sryinge are seen in front of displayed Pfizer logo
Pfizer, which developed the vaccine with German partner BioNTech SE, said the purpose was to study transmission of the coronavirus in a "real-life scenario" after the population has been vaccinated. In May, Butantan said mass vaccination had reduced COVID-19 death by 95% in the town with a population of 45,644 people. The institute is considering extending the study for a third dose.
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