SINGAPORE: A Singapore study that tested the household close contacts of COVID-19 patients has found that an estimated 23 per cent of those ...
"Multiple studies including an analysis from Singapore reported in our local media have demonstrated onward transmission from pre-symptomatic patients while they were still asymptomatic," he said.after visiting the same church as an infected couple from Wuhan.One woman who fell ill sat in the same seat in the church that the couple had occupied earlier that day.
Asymptomatic COVID-19 cases are labelled presymptomatic if they develop COVID-19 symptoms later. A COVID-19 positive person can only be classified presymptomatic after observing the individual, usually for at least a week, for the development of symptoms, said Assoc Prof Ng.Singapore has not disclosed national figures for asymptomatic cases but authorities have said that most of the cases among migrant workers are mild or show no symptoms., all of which were asymptomatic.
In Vietnam, which has kept the number of COVID-19 cases to just slightly more than 300, almost 37 per cent did not display any symptoms, Reuters has reported, citing health ministry data.A study on the coronavirus cases on board the Diamond Princess cruise ship had found that about 18 per cent of the 634 cases were asymptomatic.
An editorial in the New England Journal of Medicine on May 28 called asymptomatic transmission the"Achilles’ heel" of the US' strategies to control COVID-19.
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