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China’s COVID vaccines have been crucial — now immunity is waning

Raimunda Nonata, 70, is inoculated with the Sinovac Biotech's CoronaVac vaccine inside her house in Brazil.

A woman receives a dose of Sinovac’s CoronaVac COVID-19 vaccine in Cachoeira do Piria, Brazil, in January. Credit: Tarso Sarraf/AFP via Getty

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Nature 598, 398-399 (2021)



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