HONG KONG: A Hong Kong man who recovered from COVID-19 was infected again four-and-a-half months later in the first documented instance of human re-infection, researchers at the University of Hong Kong said on Monday ., will continue to spread amongst the global population despite herd immunity, they said.The 33-year-old male was cleared of COVID-19 and discharged from a hospital in April, but tested positive again after returning from Spain via Britain on Aug 15.
He was found to have contracted a different coronavirus strain from the one he had previously contracted and remained asymptomatic for the second infection. Instances of people discharged from hospitals and testing positive again for COVID-19 infection have been reported in mainland China. However, in those cases it was not clear whether they had contracted the virus again after full recovery - as happened to the Hong Kong patient - or still had the virus in their body from the initial infection.
One explanation was that the virus still existed in the lungs of patients but was not detected in samples taken from upper parts of the respiratory tract, he said. Other possible causes were low sensitivity of tests and weak immunity that could lead to persistent positive results, he added.
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