COVID-19 is a respiratory illness and is largely spread via droplets in the air. These are typically expelled when an infected person coughs or sneezes.
Once symptoms develop, a person’s viral load declines steadily, and they become increasingly less infectious. However, people appear to keep shedding the virus for around two weeks after they recover from covid-19, both in their saliva and stools. This means that even once a person’s symptoms have cleared, it may still be possible to infect other people.
People with mild or no symptoms can have a very high viral load in their upper respiratory tracts, meaning they can shed the virus through spitting, touching their mouths or noses and then a surface, or possibly talking. The new corona-virus has also been found to persist for days on surfaces, though that doesn’t necessarily mean these virus particles could still infect other people. That could be diminished by ultraviolet light, heat or humidity.
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