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SINGAPORE – News that a 33-year-old man in Hong Kong was reinfected with Covid-19 has sparked fears that people can catch the disease more than once, but infectious disease experts said this is rare and not a cause for worry, unless many more cases surface.
Most people develop a robust immune response after a Covid-19 infection, but for reasons that are currently unknown, the man in Hong Kong had failed to mount an antibody response to the first infection in late March.
He was hospitalised and discharged on April 14 after two negative swabs from his nasopharynx and throat. Then, he tested positive for Covid-19 on a saliva test on Aug 15, after returning from a trip to Spain via Britain.
Researchers at the University of Hong Kong (HKU) said they found the world’s first documented case of reinfection, after they sequenced the virus from the man’s infections and found that he had a different strain from the one in March.
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