Coronavirus: Brazil halts trial of Sinovac vaccine after 'unrelated' death of volunteer

Brazil's health regulator has halted clinical trials of a coronavirus vaccine being made by Chinese drug firm Sinovac after a 'serious adverse effect'. The regulator, Anvisa, did not provide any further details but said the incident took place on 29 October. 'With the interruption of the study, no new volunteer can be vaccinated,' a statement on its website read.