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Biochemist Daniela Beatriz Ori manipulates swab samples to make a real time polymerase chain reaction (RT-PCR) analysis for COVID-19 testing at the biochemistry lab of Central Navy Hospital Dr. Pedro Malloon April 28, 2020 in Buenos Aires, Argentina. (Photo by Amilcar Orfali/Getty Images)
Heavy snow falls as people wearing face masks to curb the spread of COVID-19 cross a road in Burnaby, B.C., on Monday, December 21, 2020. THE CANADIAN PRESS/Darryl Dyck
People walk past a "we're open, heated terrace dining" sign at Eli's Essentials on the Upper East Side on February 02, 2021 in New York City. (Photo by Alexi Rosenfeld/Getty Images)
Mother putting a face mask on her daughter. (August de Richelieu/ Pexels)

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New | Official: Chinese vaccines' effectiveness low

In a rare admission of the weakness of Chinese coronavirus vaccines, the country's top disease control official says their effectiveness is low and the government is considering mixing them to get a boost.

A nurse prepares the Sinovac's COVID-19 vaccine at the Ministry of Information during the inoculation campaign against the COVID-19 virus in Phnom Penh, Cambodia, Thursday, April 1, 2021. Some five thousand Cambodians including journalists and ministry members began receiving some of the 1.5 million doses of Chinese-made Sinovac vaccines that were bought from China. (AP Photo/Heng Sinith)

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New | Official: Chinese vaccines' effectiveness low

In a rare admission of the weakness of Chinese coronavirus vaccines, the country's top disease control official says their effectiveness is low and the government is considering mixing them to get a boost.