London:Symptoms of Covid-19 infection appear in 42 hours after being exposed to SARS-CoV-2 virus, much earlier than previously thought, finds a study.
According to the World Health Organisation (WHO), Covid symptoms take around five to six days to appear after infection.
But the study led by Imperial College London researchers showed that symptoms start to develop very fast, on average about two days after contact with the virus.
The infection first appears in the throat; infectious virus peaks about five days into the infection and at that stage is significantly more abundant in the nose than the throat.
