The clinical trials in Brazil are being conducted by Sao Paulo-based research institute Butantan. Dimas Covas, the head of the state-run institute, told a local television station that a volunteer had died, but the death was ruled not due to the vaccine.

The Sinovac vaccine is the third to be put on hold after a volunteer became ill after being inoculated. U.S. pharmaceutical giant Johnson & Johnson put a hold on its late-stage clinical trials of its COVID-19 vaccine last month, while another U.S.-based drugmaker, AstraZeneca, halted its late-stage trial of a vaccine developed with the University of Oxford in September after a volunteer in Britain was diagnosed with transverse myelitis, an inflammatory syndrome that affects the spinal cord and is often sparked by viral infections. 



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