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Work by researchers in Hong Kong founds that reinfection may be possible in rare cases.

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.

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NURSING HOME: Experimental drug used to stop COVID-19 spread

The coronavirus crept into Heartland Health Care Center, a nursing home in Moline, Ill., on the last day of July, when a member of the nursing staff tested positive.

It was an ominous sign: The virus can spread through a nursing home in a flash. Older people — who are often sick and frail and need regular hands-on attention — are uniquely susceptible. Staff members who care for residents are at high risk of infection and of unintentionally spreading the virus.

Although nursing home residents make up just 1.2 percent of the United States population, they account for about 40 percent of Covid-19 deaths.

But this time, the nursing home was not defenseless. Heartland was the first facility to participate in a large clinical trial of a drug that might protect residents from the infection in nursing homes and assisted living facilities.

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How does coronavirus spread at a concert? Germans do a test

BERLIN (AP) — Germany held a pop concert Saturday to see how those attending could spread coronavirus if they had it.

German researchers studying COVID-19 packed part of a Leipzig arena with volunteers, collecting data in a “real life” simulation of a pop concert but one with strict health and safety controls.

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Why Antibody Tests Won’t Help You Much

Getting an antibody test to see if you had Covid-19 months ago is pointless, according to guidelines issued this week by a major medical society.

Many tests are inaccurate, some look for the wrong antibodies and even the right antibodies fade away, said experts at the Infectious Diseases Society of America, which issued the new guidelines.

Because current tests cannot determine if someone is immune, the society said, they “cannot inform decisions to discontinue physical distancing or lessen the use of personal protective equipment.”

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