Covid 19 coronavirus: Man, 33, world's first 'proven' known documented case of Covid-19 reinfection
Man in Hong Kong infected for a second time with Covid-19. A different strain.
"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 in a statement.
The findings are equally alarming because it suggests the threat of reinfection to coronavirus exists "even if patients have acquired immunity via natural infection or via vaccination", they said.
"Many believe that recovered Covid-19 patients have immunity against reinfection because most developed a serum neutralising antibody response.
"However, there is evidence that some patients have waning antibody level after a few months."
Our findings suggest that the SARS-CoV-2 may persist in the global human population as is the case for other common cold-associated human coronaviruses, even if patients have acquired immunity via natural infection,"
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