COVID-19: Boosting with an mRNA vaccine offers better protection in people who received two doses of CoronaVac

One year after mass vaccination against COVID-19 was launched, inactivated virus vaccines accounted for half of the doses administered worldwide. Now, a large observational study performed in Brazil shows that, in people who initially received two doses of the inactivated CoronaVac vaccine, an mRNA boost offers considerably better protection against mild and severe COVID-19 than a boost with the same vaccine.

from Latest Science News -- ScienceDaily https://ift.tt/tbkVHaU