COVID-19 symptom severity 'no indication' of viral shedding

A world-first study offers insight into a key public health question about transmission, researchers say

The world's first 'human challenge' trial in which volunteers were deliberately exposed to SARS-CoV-2 has found that symptoms have no effect on how likely an infected person is to pass the infection on to others.

The UK study showed that among the 18 participants who developed COVID-19, the severity of symptoms, or whether they displayed symptoms at all, had nothing to do with the viral load in their airways.

Viral load was measured by a focus-forming assay (FFA) and quantitative polymerase chain reaction (qPCR) in the

Latest