Moderna, Pfizer and AstraZeneca: What is the latest on COVID-19 vaccine from the manufacturers?

Moderna, Pfizer and AstraZeneca: What is the latest on COVID-19 vaccine from the manufacturers? This past week was an action packed in terms of announcements from Moderna, Pfizer and AstraZeneca-University of Oxford. All of them have reported positive data on their vaccine safety and efficacy, raising hopes of availability of a potential safe Covid-19 vaccine by end of December or January next year.

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