Merck discontinues development of 2 Covid-19 vaccine candidates due to an inferior immune response…

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https://www.nbcnews.com/health/health-news/merck-discontinues-two-covid-19-vaccine-candidates-n1255503

https://www.nbcnews.com/health/health-news/merck-discontinues-two-covid-19-vaccine-candidates-n1255503

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