An entire Brazilian city will be vaccinated against COVID-19 in a giant experiment to test whether vaccines reduce the spread of the virus.
The city of Serrana, in the state of São Paulo, is home to around 30,000 adults who will all be offered a COVID-19 vaccine within the next three months as part of a research study conducted by the Butantan Institute in Brazil.
All city residents over 18 (except pregnant or breastfeeding women and people with serious illnesses) will be offered the CoronaVac vaccine, developed by the Chinese company Sinovac, CNN reported. The purpose of the study, known as “Project S”, is to determine whether the vaccine will reduce the spread of the virus.
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While clinical trials have clearly shown that Sinovac and other COVID-19 vaccines decrease the chances of developing symptomatic illness, data on whether vaccines could completely prevent infections (even asymptomatic) remain limited. Some of the early clues suggest that at least some vaccines can prevent infections; a few weeks ago, the University of Oxford published data indicating that the Oxford-AstraZeneca vaccine could slow the spread of …
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