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Hong Kong Confirms First Case Of COVID-19 Reinfection Anywhere In The World

Courtesy of ZeroHedge View original post here.

Remember when the 'experts' warned that there was no credible evidence of coronavirus reinfection, claiming the notion that patients can be reinfected with the virus is categorically absurd? Well, since then, it looks like the New York Times has published stories arguing everything from 'reinfection is so rare as to make it a non-issue', to signs that 'lasting protection might be elusive for some'.

It's just one more sign of how little scientists know about the virus, and the latest reminder that projections for workable mass-produced vaccines that are also "safe" is an incredibly high bar to set before the end of the year.

Still, the WHO's official position is that reinfection is possible, and that has been the case since early days of the pandemic. There's still a lot we don't know, including the virus's ability to infect pets/zoo animals. And now, researchers in Hong Kong have reportedly confirmed the first documented case of reinfection that meets certain scientifically rigorous standards.

Here's more from the NYT:

Researchers in Hong Kong are reporting the first confirmed case of reinfection with the coronavirus.

"An apparently young and healthy patient had a second case of COVID-19 infection which was diagnosed 4.5 months after the first episode," University of Hong Kong researchers said Monday in a statement.

The report is of concern because it suggests that immunity to the coronavirus may last only a few months in some people. And it has implications for vaccines being developed for the virus.

The 33-year-old man had only mild symptoms the first time, and no symptoms this time around. The reinfection was discovered when he returned from a trip to Spain, the researchers said, and the virus they sequenced closely matched the strain circulating in Europe in July and August.

"Our results prove that his second infection is caused by a new virus that he acquired recently rather than prolonged viral shedding," said Dr. Kelvin Kai-Wang To, a clinical microbiologist at the University of Hong Kong.

Given that there are millions of cases worldwide, it is not unexpected that a few, or even a few dozen, people might be reinfected with the virus after only a few months, experts have said.

Several cases of reinfection have been discovered in the US and elsewhere, however, scientists weren't able to use contact tracing tools and other efforts to confirm beyond a reasonable doubt that the case is a genuine reinfection.

Doctors have reported several cases of presumed reinfection in the United States and elsewhere, but none of those cases have been confirmed with rigorous testing. Recovered people are known to shed viral fragments for weeks, which can cause tests to show a positive result in the absence of live virus.

But the Hong Kong researchers sequenced the virus from both rounds of infection and found significant differences in the two sets of virus, suggesting that the patient was infected a second time.

Common cold coronaviruses are known to cause reinfections in less than a year, but experts had hoped that the new coronavirus might behave more like its cousins SARS and MERS, which seemed to produce longer-lasting immunity of a few years.

A study published back in June in the journal Nature Medicine found that antibodies, protective proteins made in response to an infection, may last only two to three months, especially in people who never showed symptoms while infected.

Hong Kong's outbreak has been waning over the past week as the strenuous social distancing measures imposed by Carrie Lam, along with a plan to test every Hong Kong resident, has slowed the infection's spread.


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