The World Health Organization said Tuesday that the likelihood of asymptomatic coronavirus carriers to transmit disease was still an open question, tempering remarks made the day before indicating it was rare.
The question hinges on whether people are asymptomatic – that is, infected but without ever exhibiting symptoms – and presymptomatic, which applies to people who have been infected and have not yet manifested illness. The latter are contagious, most experts agree.
The trick is knowing which asymptomatic people will actually turn out to be presymptomatic, WHO scientist Dr. Maria Van Kerkhove, the organization’s technical lead on the coronavirus pandemic, clarified on Tuesday.
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