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Coronavirus: Are asymptomatic Covid-19 patients safe or silent carriers?

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BEIJING : China said 300 symptomless carriers of the novel coronavirus in Wuhan, the epicentre of the pandemic, had not been found to be infectious, in a bid to reassure people as countries ease restrictions.

But some experts say asymptomatic infections are common, presenting a huge challenge in the control of the disease. What is asymptomatic and pre-symptomatic? The World Health Organization (WHO) defines asymptomatic cases as those who don't show symptoms but have been confirmed infected through a lab test.

WHO notes there are few reports of truly asymptomatic cases. The incubation period, or the time a person takes to show symptoms after getting infected, is the pre-symptomatic phase, the WHO says.

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