I don't ever assume the people that live around me live in a bubble. Many of them are very well-traveled.
Yeah... I live in an Atlanta suburb, full of business people that use the busiest airport on the planet on a weekly basis. In one month, I might be in 6+ states.
I'm in airports, restaurants, gas stations, manufacturing facilities, stores, offices, rental cars, trains, etc. If a school has 1200 kids in it, let's say it's 900 families, and most likely those people work at 500+ different locations. At thos 500+ locations, there are visitors from other states and countries. The employees travel, eat, get gas, shop, etc. It's so easy to think of scenarios where this spreads, no matter the type of group. My company is at trade shows CONSTANTLY. I was just at one for a week, and we had 10s of thousands of people visit our booth. Our booth was staffed by people from all over the country and world! So were other booths!
I saw a postal worker tested positive. Let's say this person was at a counter, or a letter carrier. This virus supposedly has the ability to live for 9 days on a surface. Whaaaat?
I don't shake hands anymore. I have been drilling it into my kids to quit touching everything when out, and also to wash their hands correctly... etc..
Good luck, everyone. LOL. That being said, I'm traveling tomorrow, and the week after, and the week after. I've got 2 trips to Disney booked this year. I'm not planning on being dead. Hopefully.