Flurry of coronavirus reinfections leaves scientists puzzled

Though far from common, some patients developed worse symptoms the second time they became infected with Covid-19

On 15 August, a 33-year-old man landed in Hong Kong after flying home from Spain. On arrival, he was screened for coronavirus. Despite feeling well he tested positive. It was the second time he had picked up Covid-19 in less than five months.

The case immediately caught scientists’ attention. The man was the first in the world to have a confirmed coronavirus reinfection and there were positives to take from the report. First and foremost, he was asymptomatic. Although reinfected with Sars-Cov-2, his immune system swung into action fast and contained the virus without him knowing.

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