CDC: Pfizer, Moderna highly effective in preventing infections

eAwaz Medicine

New York – A new study by the US Centers for Disease Control and Prevention (CDC) says Pfizer-BioNTech and Moderna’s Covid-19 vaccines are highly effective in preventing infections. After the second dose of vaccine, risk of infection was reduced by 90 per cent two or more weeks after vaccination. Even after a single dose, the risk of infection was reduced by 80 per cent within two weeks of vaccination. The study looked at their mRNA vaccines’ effectiveness in preventing infections among nearly 4,000 participants in six US states over a 13-week period from December 14, 2020 to March 13, 2021.
CDC Director Rochelle Walensky, said: “This study shows that our national vaccination efforts are working. The authorised mRNA Covid-19 vaccines provided early, substantial real-world protection against infection for our nation’s health care personnel, first responders, and other frontline essential workers.” Studies conducted in the UK and Israel showed that one dose was about 70 per cent and 60 per cent effective, respectively, against SARS-CoV-2 infection. The current results provide reassurance that people start to develop protection from the vaccine two weeks after their first dose. Those who had received both recommended doses of the vaccine, showed more effectiveness.