A 33-year-old man in Hong Kong may represent the first confirmed case of reinfection, researchers in Hong Kong said.
The man was diagnosed with COVID-19 on March 26, hospitalized, then recovered. He tested positive for SARS-CoV-2 again on August 15, and whole genome sequencing of viral isolates from the two episodes indicated they were from different clades, ...snip That is almost unassailable evidence that the man was infected a second time, and another indication, albeit far from definitive, that immunity to SARS-CoV-2 may not last very long.
Interestingly, the patient was asymptomatic during his second infection, the authors said.
Reinfection was suspected in a few previous cases of COVID-19, but never documented.
