World Faces Around 4000 COVID-19 Variants as Britain Explores Mixed Vaccine Shots World Faces Around 4000 COVID-19 Variants as Britain Explores Mixed Vaccine Shots

The world faces around 4000 variants of the virus that causes COVID-19, prompting a race to improve vaccines, Britain said on Thursday, as researchers began to explore mixing doses of the Pfizer and AstraZeneca shots in a world first.Reuters Health Information
Source: Medscape Critical Care Headlines - Category: Intensive Care Tags: Infectious Diseases News Source Type: news