Play all audios:
The team conducted contact tracing and studied Covid-19 transmission among approximately 9,000 close contacts of primary cases in the Zhejiang province of China from January 2020 to August
2020. "Close" contacts included household contacts (defined as individuals who lived in the same household or who dined together), co-workers, people in hospital settings, and
riders in shared vehicles. Of the individuals identified as primary cases, 89 per cent developed mild or moderate symptoms, and only 11 per cent were asymptomatic -- and no one developed
severe symptoms. Household members of primary cases, as well as people who were exposed to primary cases multiple times or for longer durations of time, had higher infection rates than other
close contacts. In comparison to mild and moderate symptomatic individuals, asymptomatic primary individuals were much less likely to transmit Covid to close contacts -- but if they did,
the contacts were also less likely to experience noticeable symptoms. "This study further emphasises the need for vaccination, which reduces clinical severity among people that develop
Covid," Martinez said. (_This story was published from a syndicated feed. Only the headline and picture has been edited by FIT.)_