My son is in a long distance relationship with a woman in Japan. He has visited there many times. There covid numbers are much lower than ours even though they live practically on top of each other. There are some interesting differences between their society and ours. They are all pretty much wearing masks. When using mass transit, they don't talk with their fellow travelers. It's actually considered rude. Talking sends lots of particles out. Your mask helps to reduce that. So does keeping to yourself.