COVID-19 can spread 1 to 3 days before symptoms appear, US study on Singapore cases shows

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People infected with the novel coronavirus can transmit the infection one-to-three days before symptoms start to appear, according to a study ...

Of the cases in Singapore, 157 were locally acquired and 10 of these were likely transmitted before symptoms started to show.The fast-spreading virus has claimed more than 43,000 lives globally, with nearly 4,000 in the United States.

The findings increase the challenges of containment measures, the researchers wrote, but said the magnitude of the impact depends on the extent and duration of transmissibility while a patient is pre-symptomatic and that has so far not been clearly established. Transmissions might take place through respiratory droplets or even speech and other vocal activities such as singing, with the rate of emission corresponding to voice loudness, according to the researchers.While the cases were carefully investigated, the CDC said it was possible an unknown source might have caused the clusters.

 

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i0n1c Note: this is secondary research by the US.

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