[alex_smart]

>but there is little reason to take unnecessary risks

That seems to have been the mindset behind authorities deciding not to disseminate this information to the public. But I am not convinced.

That argument only makes sense if people's ability to be cautious and attentive and disciplined in following rules is an infinite resource. You have given people multiple rules they need to follow to avoid getting the virus without informing them which ones are more important to follow than others. For example consider the two guidelines: don't meet people in indoor spaces and don't touch unsanitized surfaces. Both require similar amount of effort/discipline but breaking the first is thousands of times more dangerous than the other.