Pfizer and Moderna are testing their coronavirus v..

5 taon - Isalin

Pfizer and Moderna are testing their coronavirus vaccines to see if they work on the new mutated version of the virus found in the UK and elsewhere. The virus has mutated before, and both companies say they found their vaccines worked on other variants. #Covid19
https://edition.cnn.com/2020/1....2/22/health/us-coron