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Explainer: What's behind varying efficacy data for Sinovac's vaccine?

New efficacy data from Brazil on Sinovac's Covid-19 vaccine, for which there are now four widely different success rates, raised more questions than answers, as many developing countries pin their hopes on the CoronaVac to end the pandemic.

Here are potential factors contributing to CoronaVac's varying efficacy rates and expert interpretations...

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