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"Estimates suggest that anywhere between 6% and 41% of the population may be infected but not have symptoms," Maria Van Kerkhove, a top World Health Organization official, said June 9.Īsymptomatic coronavirus carriers are hard to find and study - because people usually get tested for the coronavirus only if they think they may have it. The percentage of people with asymptomatic infections is unclear.
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It also demonstrates that the intense scrutiny applied to novel coronavirus infections could shed light on how other respiratory diseases operate: Asymptomatic carriers of flu or common cold viruses are not studied much, so it's unclear whether the documented inflammation is a typical immune response or specific to the novel coronavirus. The study shows that being asymptomatic doesn't always mean that no damage has occurred in someone's body follow-up studies will help researchers assess for potential long-term impacts. It finds that many of the people studied developed signs of minor lung inflammation - akin to walking pneumonia - while exhibiting no other symptoms of the coronavirus. The virus can still be causing mild - although likely reversible - harm to their lungs.Ī new paper in Nature Medicine, published June 18, documents the clinical patterns of asymptomatic infections.
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He had tested positive for the coronavirus and experienced shortness of breath.Įven if someone is infected by the novel coronavirus and remains asymptomatic - free of coughing, fever, fatigue and other common signs of infection, that doesn't mean the coronavirus isn't taking a toll. A CT scan of the chest of a 66-year-old male reveals patchy rounded hazy spots throughout the lungs.