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Once COVID-19 symptoms begin, the virus is live and can be grown for around seven days, according to US research, while people can still test positive for up to 34 days. Our current COVID-19 tests look for viral genetic material rather than live virus, so researchers from Korea were keen to see how long people actually shed live viruses that they could grow in culture. The small study of 21 patients found that the longest gap between symptom onset and being able to grow the virus was 12 days. The authors say their findings may be useful in guiding isolation periods for patients with COVID-19 and in estimating the risk of secondary transmission among close contacts in contract tracing.
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