A study of patients who initially tested negative for the virus, but weeks later tested positive again, has found they do not appear to pass the disease to personal contacts such as family members. covid19
South Korean soldiers wearing protective masks sit at a temperature screening point at Incheon International Airport, South Korea, on March 9.SeongJoon Cho/Bloomberg via Getty Images
To find out, the scientists followed up with nearly 800 of those people's personal contacts, such as family members. They found no evidence that they had contracted the virus from the people who had a fresh positive result. The scientists also tried to grow the virus in secretions from these patients. They could not.the South Korean CDC no longer recommends that people in this situation be isolated.
The test, known as PCR , looks for genetic material from the virus. Both in the case of the Wisconsin study and that from South Korea, the level of genetic material from the virus in the sample was very low, Hess notes. That's consistent with the idea that it's simply biological residue, not signs of an active viral infection.
Scientists are trying to gather enough data about this to have more definitive answers about when it's safe for a recovered patient to go back to work or to return to a nursing home, even if the PCR test shows signs of the coronavirus.
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