KOREAN CENTERS FOR DISEASE CONTROL

Dead Covid-19 particles muddy test results

The so-called SARS-CoV-2 virus dies one to two weeks after infecting and proliferating inside respiratory cells, doctors at the National Medical Center in Seoul told reporters on Wednesday. Pieces of the virus’s genetic material may remain in cells and be detected by a nucleic acid test a month or two after infection, underscoring the limitation of testing, they said.