“Once you’re a short distance from someone, it’s the duration that matters. If you’re exposed for 10 seconds, you must be very unlucky for the particles from the mouth of the infected person to get to your mouth or your nose. But if you stay there one hour, of course you will try your luck 60 times with respect to one minute”.
The researchers found that longer exposures at greater distances had a similar risk to shorter exposures at closer distances.
There’s no golden rule about how much time you can spend with an infected person before getting COVID-19 yourself, as this can change according to what the infected person is doing. For example, if they were coughing a lot, the other person would have more chances of getting infected.
But the longer someone spent with another person who was sick, the more likely they were to get sick themselves, even if they kept a 2-metre distance at all times.
Source: Avoiding COVID was about more than just keeping 2 metres apart, study finds | Euronews


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