Low Efficacy of Chinese Shots Sows Concern on Global Rollout
- Senior official acknowledged vaccines’ efficacy is ‘not high’
- Sinovac efficacy rate affirmed at 50%, lower than other shots
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Concern is mounting that China’s Covid-19 vaccines are less effective at quelling the disease, raising questions about nations from Brazil to Hungary that are depending on the shots and the country’s own mammoth inoculation drive.