A new Japanese study has shown that people have peak viral loads 3-6 days after the onset of ... More symptoms, raising further doubt about the CDC's decision to lower self-isolation time from 10 ...

Onset and window of SARS-CoV-2 infectiousness and temporal correlation with symptom onset: a prospective, longitudinal, community cohort study. The Lancet Respiratory Medicine, 2022; DOI: 10.1016 ...

But “there is no such thing as an infectiousness test for COVID,” points out Butler-Wu. In some cases, live viruses can be raised in a lab, but a person won’t be infectious.

They noted that the pooled infectiousness variance estimate from 14 analyses showed that 20% of most SARS-CoV-2 contagious patients had 3.1 times greater infectiousness than the average cases.

In patients with non-severe symptoms, their period of infectiousness could instead be counted as 10 days from symptom onset," says Dr. Cevik.

The following is a summary of some recent studies on COVID-19. They include research that warrants further study to corroborate the findings and that has yet to be certified by peer review.

For that reason, as the above chart shows, the daily antigen tests are believed to reduce infectiousness 100 percent. They aren’t designed for personal care, because the sensitivity isn’t high ...

The period of infectiousness may also not exactly align with the successful culturing of the live virus from samples, although these are likely to broadly overlap.