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Continue to ChatUna sola dosis de las vacunas de AstraZeneca o Pfizer reduce la transmisión del virus Covid-19 hasta un 50% https://www.lapatilla.com/2021/04/28/una-sola-dosis-de-las-vacunas-de-astrazeneca-o-pfizer-reduce-la-transmision-del-virus-covid-19-hasta-un-50/