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RIO DE JANEIRO, BRAZIL - The Chinese-developed Coronavac COVID-19 vaccine has demonstrated a 50 percent efficacy following tests in Brazil, the organization in charge of its production in the South American country said on Tuesday, January 12th.

Coronavac has been given to frontline health care workers in close contact with coronavirus patients.

The Butantan Institute repeated its claim from last week that the vaccine is 78 percent effective in mild cases that needed treatment and showed 100 percent efficacy in moderate to serious cases.

"It's a safe, effective vaccine that ticks all the boxes to justify its use . . .

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