People with Covid-19 can infect others 2-3 days before symptoms appear.
Contagiousness started 2-3 days before symptoms, and peaks at 0.7 days before the first signs of cough or fever.
44% of people get infected by people with no visible signs of illness.
On average, it takes 7 days to develop symptoms after getting infected.
Many infections cannot be linked to known Covid-19 cases or travel to hotspots, which indicates asymptomatic transmission.
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