The following is a summary of some recent studies on COVID-19. They include research that warrants further study to corroborate the findings and that has yet to be certified by peer review.
- provided significant additional protection. Effectiveness against infection starting 14 days after vaccination completion ranged from 39.4% for Sinovac's CoronaVac to 64.8% for the Pfizer/BioNTech shots. Effectiveness against hospitalization or death ranged from 81.3% for CoronaVac to 89.7% for Pfizer/BioNTech's vaccine.
For the study of so-called convalescent plasma, U.S. researchers enrolled more than 1,000 mostly unvaccinated adults within eight days of the onset of COVID-19 symptoms. Half of the participants were randomly assigned to receive a convalescent-plasma transfusion. Four weeks later, 2.9% of those who received the plasma had been hospitalized for COVID-19, compared to 6.3% of those who did not receive it.
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