WASHINGTON - People infected with the novel coronavirus can transmit the infection one-to-three days before symptoms start to appear, according to a study published by the US Centres for Disease Control and Prevention .
Of the cases in Singapore, 157 were locally acquired and 10 of these were likely transmitted before symptoms started to show. 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.
While the cases were carefully investigated, the CDC said it was possible an unknown source might have caused the clusters.
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