People with severe COVID-19, many of whom are hospitalized, could be infectious for as long as 20 days, though most of them are not.
The majority of those with severe disease, more than 88%, were no longer infectious after 10 days. Ninety-five percent were no longer infectious after 20 days, the CDC said.COVID-19 is a wily virus in that patients seem to be most infectious two to three days before they begin to show symptoms, Shapiro said.cited by the CDC found people were much more likely to catch COVID-19 if they were exposed to someone who was sick within the first five days the person having symptoms.
It did note that SARS-CoC-2 virus emerged only in December, and there aren't many places where there have been many infections for that entire time, so possible reinfection is still a subject of investigation. The first is that testing may find bits of the virus in a recovered patient's nasal cavity, but the viral particles are no longer capable of reproducing. That test result could come up as positive but the person wouldn't be able to infect others.
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