The research, published in the Lancet Medical Journal, investigated the case of a 25-year-old man living in Nevada who became infected with two different genetic variants of the SARS-CoV-2 virus in less than two months. They tested negative twice in between, meaning they are unlikely to suffer a prolonged infection.
US President Donald Trump said he was immune to the virus after an encounter. Any new findings on resistance may also have implications for the vaccine as drug manufacturers run towards the finish line.
The degree of protective immunity following a Kovid-19 infection is one of the great unknowns of the epidemic.
A handful of revision cases have been reported since the outbreak began late last year. An Ecuadorian patient also suffered the disease for the second time, and an elderly woman died in the Netherlands after a second trial. It is also possible that people without any symptoms can become infected many times without knowing it.
The Nevada man first tested positive for the virus in mid-April after experiencing headaches, coughs, nausea, and diarrhea. He had no underlying condition that could worsen his illness. He split up and got better by the end of the month.
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In late May, however, the man consulted at an urgent care center in addition to the symptoms of fever and dizziness that he had experienced the month before. Five days later, he was admitted to the hospital with shortness of breath and given oxygen once again before testing positive for Kovid-19.
The scientists sequenced the genome of the patient’s virus samples and found significant differences, suggesting that the man was infected with two different versions of the coronovirus.
The researchers said they could not be sure why the second infection was worse. It is possible that the second time the patient was exposed to high doses of the virus, the variant he was experiencing was more viral or even the presence of antibodies from the first infection to defect in a twist seen with another coronovirus Was. It is also possible – but unlikely – that a continuous transition with some sort of passive-reactivation was dynamic, he wrote.
“There are still many unknowns,” said Mark Pandori, director of the Nevada State Public Health Laboratory and the lead author of the study. “Our findings indicate that previous SARS-CoV-2 infections may not protect against future infections. The possibility of reinvestigation may have important implications for our understanding of Kovid-19 immunity, particularly in the absence of an effective vaccine. ”
(Updated with death of Dutch woman in fifth paragraph)
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