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China's Sinovac Vaccine 50.7% Effective Against COVID With Symptoms


The benchmark for a vaccine worth using is 50%.
The trial of Sinovac s CoronaVac vaccine tested the shot in more than 12,000 health workers.
The COVID-19 vaccine from Chinese biotech Sinovac is about 50% effective at preventing symptomatic coronavirus, a late-stage trial in Brazil showed.
The two-dose CoronaVac vaccine was safe and 50.7% effective against symptomatic COVID-19, Sinovac s Brazilian partner, Butantan, said in a preprint posted Sunday, confirming top-line results announced by the group in a press release in January.
The World Health Organization (WHO) said April 2020 that a vaccine that was 50% effective in trials was worth using.
Butantan said that efficacy to prevent any symptomatic COVID-19 started at 50.7% and became more extensive as disease severity increased. The study authors found CoronaVac was 100% effective against severe COVID-19, but the number of cases was too small for them to be confident in the figure. ....

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Regulators Find AstraZeneca Vaccine Linked With Rare Clots: Official


CRISTINA QUICLER / Contributor / Getty Images
A European official said Tuesday there was a link between AstraZeneca s COVID-19 vaccine and blood clots.
Marco Cavaleri, head of vaccines at the EMA, said the mechanism causing the brain blood clots wasn t yet clear.
The clots are most common in younger women, he said.
The European medicines regulator has found a link between AstraZeneca s COVID-19 vaccine and rare blood clots in younger women, an official said Tuesday.
The exact cause of the rare brain clots in vaccinated people was not yet known, Marco Cavaleri, head of vaccines at the European Medicines Agency (EMA), told Italian newspaper Il Messagero. ....

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Fauci backs study that says 3-foot social distancing safe for schools


Dr. Anthony Fauci said 3-foot physical distancing in schools appeared to be safe.
Current CDC guidance recommends at least 6 feet of distancing.
A study showed 6-foot distancing did not reduce COVID-19 cases compared with 3-foot distancing.
Dr. Anthony Fauci on Sunday said 3 feet of distancing between schoolchildren, rather than the recommended 6 feet, might be good enough for schools to reopen safely, following a new study published Wednesday.
The study found that increasing physical-distancing requirements in Massachusetts schools to 6 feet from 3 feet did not make a difference in the number of COVID-19 cases among staff or pupils. Almost all of the kids and all staff members in the study wore masks. ....

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