A DOCTOR has been diagnosed with coronavirus for the second time, three months after recovering from a previous bout of the disease.
The Israeli medic reportedly contracted the virus in April during the initial coronavirus outbreak and tested negative in May and June.
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But after coming into contact with a Covid-19 carrier this month, she again tested positive, the Times of Israel reports.
Second positive tests represent an unknown in the battle against the coronavirus as it is assumed anyone who has been infected has developed antibodies, giving them immunity.
Israel has seen 430 coronavirus deaths and around 56,000 cases but a recent surge in cases saw the re-imposition of control measures.
The medic works at the Sheba Medical Center in the town of Ramat Gan, near Tel Aviv and she is reportedly the second person from the area to test positive after apparently recovering.
“What we are seeing is very frightening,” Professor Gabriel Izbicki of Jerusalem’s Shaare Zedek Medical Center told The Times of Israel.
“More than half the patients, weeks after testing negative, are still symptomatic. There is very little research about the mid-term effect of coronavirus.”
Earlier this month, members of staff at working at the coronavirus ward of the Wolfson Medical Center in Holon, Israel, who had contracted the virus were found to be antibody free.
That led to concerns that some recovered COVID-19 patients may not have any immunity.
“It is worrying [to consider]why they don’t have antibodies,” Margarita Mashavi, head of internal medicine at Wolfson Medical Center in Holon.
Second positive tests are a phenomenon that is still yet to be fully understood and scientists are unsure if people can catch Covid-19 twice.
From what is known about viruses, people who have had Covid-19 already should develop a level of immunity.
There are numerous accounts of people testing positive twice but doctors say there is no as yet clear evidence of widespread vulnerability to reinfection.
Back in April it emerged that patients in China were testing positive again for the disease 70 days after being given the all clear, leaving doctors baffled.
There have been recent studies that appear to show antibody levels dropping off after two to three months, while others show they stable and even increase, the Washington Post reports.
Some people could be suffering from a re-emergence of the same illness from virus that had been lurking somewhere in their body.
Their positive Covid-19 tests could have been false positives – a result that shows you have something when you haven’t.
That happened in South Korean when hundreds who tested positive for Covid-19 even after they recovered
The country’s infectious-disease experts said that the positive test results were likely caused by flaws in the testing process.
The tests picked up remnants of the virus without detecting whether the person was still infected.