The world’s first “human challenge” trial in which volunteers were deliberately infected with COVID-19 has found that people typically develop symptoms very quickly – on average, within two days of being exposed to the virus, according to a new study.
Researchers at Imperial College London who infected 36 people found that symptoms start to develop within about 42 hours, which is earlier than the widely held view that the bug has an incubation period of around five days, Reuters reported.
The virus peaks about five days into infection and at that stage, it is significantly more abundant in the nose than the throat, where the infection first appears, according to the study.
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