Scientists know that people are contagious in the early stages of infection with COVID-19, but just how contagious and for how long remains unclear. What to know:
One species of monkeys infected with high levels of the new virus, officially called SARS-CoV-2, began shedding the virus within a few days, Rockx says. “All the animals were shedding from the nose and throat very early after inoculation,” he says, with a peak 3-4 days after infection. The virus could still be detected up to 2-3 weeks after infection, though it wasn’t clear whether those monkeys were still contagious, Rockx says. “There didn’t seem to be a lot of infectious virus,” he says.
It’s hard to know for certain when someone is no longer contagious, because diagnostic tests can find out only if someone has viral particles in their system, Sick-Samuels says. “At this time, it is not clear if detecting genetic material of the virus means that the virus is still alive and infectious or if the test is detecting remnants of dead virus.”
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