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Scientists Say Hong Kong Man Got COVID-19 A Second Time

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University of Hong Kong scientists claim to have the first evidence of someone being reinfected with the virus that causes COVID-19.

Genetic tests revealed that a 33-year-old man returning to Hong Kong from a trip to Spain in mid-August had a different strain of the coronavirus than the one he’d previously been infected within March.- Dr. Kelvin Kai-Wang To, the microbiologist who led the work.

The man had mild symptoms the first time and none the second time; his more recent infection was detected through screening and testing at the Hong Kong airport.

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It shows that some people do not have lifelong immunity to the virus if they’ve already had it, To said. We don’t know how many people can get reinfected. There are probably more out there.

The paper has been accepted by the journal Clinical Infectious Diseases but not yet published, and some independent experts urged caution until full results are available.

Whether people who have had COVID-19 are immune to new infections and for how long are key questions that have implications for vaccine development and decisions about returning to work, school, and social activities.

Even if someone can be infected a second time, it’s not known if they have some protection against serious illness, because the immune system generally remembers how to make antibodies against a virus it’s seen before.

It’s not clear how different a virus needs to be to trigger illness, but the new work suggests that COVID patients should not be complacent about prevention measures and should continue social distancing, wearing masks, and other ways to reduce infection, To said.

Two experts with no role in the work agreed.

We’ve always known reinfection was a possibility and I think this is highly suggestive that it occurred in this case, said Dr. Jesse Goodman, a former U.S. Food and Drug Administration chief scientist now at Georgetown University.

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