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Continue to ChatVacuna de Pfizer es menos efectiva contra la variante sudafricana de COVID-19 https://cdmxpress.com/vacuna-de-pfizer-es-menos-efectiva-contra-la-variante-sudafricana-de-covid-19/
Vacuna de Pfizer es menos efectiva contra la variante sudafricana de COVID-19 https://cdmxpress.com/vacuna-de-pfizer-es-menos-efectiva-contra-la-variante-sudafricana-de-covid-19/