HONG KONG, BEIJING and CAJICA, Colombia – Anvisa, Brazil’s health care surveillance agency, has halted the final-stage trials for Beijing, China-based Sinovac Biotech Ltd.’s COVID-19 vaccine candidate Coronavac after a serious adverse event occurred on Oct. 29 and was communicated to the regulator. Anvisa then evaluated the data and suspended the trials after weighing the risk-benefit of continuing them in the country, it said.