Alexánder Chepurnov, científico del Instituto de Medicina Clínica y Experimental de la ciudad rusa de Novosibirsk y exempleado del centro de virología y biotecnologías Véktor, que actualmente trabaja en una vacuna contra el nuevo coronavirus, decidió no respetar medidas de prevención y, a propósito y sin mascarilla, entró en contacto con personas infectadas para comprobar en carne propia cuánto dura la inmunidad que supuestamente garantizan los anticuerpos.
Las conclusiones de su experimento no han sido muy esperanzadoras: el investigador descarta que se desarrolle la llamada inmunidad de rebaño.









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