REUTERS/Lucy Nicholson
- Coronavirus patients can transmit the virus to others before their symptoms start.
- A recent study found that nearly half of patients in Singapore and 62% of patients in Tianjin, China transmitted the virus when they were pre-symptomatic.
- Another study found that up to one quarter of secondary infections can occur when the initial patient isn't showing symptoms.
- The studies provide further support for social distancing policies that limit large public gatherings.
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As the coronavirus pandemic sweeps across the globe, people with symptoms — a fever, dry cough, or difficulty breathing — have been told to self-isolate at home. But a new pair of studies suggests that many coronavirus patients are contagious before their symptoms appear.
Researchers in Belgium and the Netherlands recently examined clusters of coronavirus patients in Singapore and Tianjin, China. Their study, which is still awaiting peer review, found that 48% of the Singapore patients and 62% of the Chinese patients transmitted the virus before their symptoms started to appear.
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