So Covid is a pandemic and highly contagious with skyrocketed cases, deaths etc...yet we don't see a single individual who shows signs of being sick.As for the cases of flu being down,I am not sure that is because of masks or social distancing but it could be from the fact that flights are banned from China and the flu is not coming into North America.
I agree - Not as many people coming from China and therefore less exposure could also be having a large effect.
Also if you're like I am, my person to person contact with strangers is way down because of Covid so am less likely to notice if other people are sick (also being masked up makes it tough to tell if someone is sick).
People who are sick with Covid are also obligated to quarantine at home so again less likely that you would be (or shouldn't be) in close contact with them to notice if they are sick.
