[dabigv13]

I think passing somebody in a parking lot without a mask would be extremely low risk, unless they coughed right in your face.

It is a tricky balance, because it's all about a threshold of risk based on incomplete information.

Consistency and simplicity are the key things. But the risk is a spectrum, and you have to make arbitrary decisions, like the 6 foot rule, that are only loosely based on science. 

I don't think there is anything special about 24 hours. If you see a covid positive patient for 5 minutes on three consecutive days, are you more or less at risk than 15 minutes in one go? I don't think that is knowable at this time.

[dabigv13]

I think passing somebody in a parking lot without a mask would be extremely low risk, unless they coughed right in your face.

It is a tricky balance, because it's all about a threshold of risk based on incomplete information.

Consistency and simplicity are the key things. But the risk is a spectrum, and you have to make arbitrary decisions, like the 6 foot rule, that are only loosely based on science. 

I don't think there is anything special about 24 hours. If you see a covid positive patient for 5 minutes on three consecutive days, are you more or less at risk than 15 minutes in one go? I don't think that is knowable at this time.