First reinfection with Covid-19 documented in Hong Kong, researchers say

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RResearchers in Hong Kong reported on Monday what appears to be the first confirmed case of re-infection with Covid-19, a 33-year-old man who was first infected with SARS-CoV-2 in late March, then four months and half later. , apparently contracted the virus again while traveling in Europe.The case raises questions about the durability of immune protection against the coronavirus. But it was also greeted with caution by other scientists, who questioned to what extent the case indicated broader concerns about reinfection.

There have been scattered reports of cases of re-infection with Covid-19. These reports, however, were based on anecdotal evidence and largely attributed to shortcomings in testing.

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But in this case, researchers at the University of Hong Kong sequenced the virus from the patient’s two infections and found that they did not match, indicating that the second infection was unrelated to the first. There was a difference of 24 nucleotides – the “letters” that make up the virus’s RNA – between the two infections.



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