Case of man reinfected with coronavirus stokes immunity fears
Hong Kong case leads scientists to doubt development of antibodies in previous patients, but other experts say it is no cause for alarm
A young man has been diagnosed with coronavirus more than four months after he recovered from a first episode of the disease, suggesting that immunity to the virus can be short-lived and raising more questions about vaccines against Covid-19.
The case in Hong Kong is the first lab-confirmed reinfection. Genetic sequencing by scientists at the University of Hong Kong established that the second episode, in an otherwise healthy young man, was caused by a slightly different strain. Researchers had hoped that the man’s immune system would still have recognised and fought off the virus at the second encounter.
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