Hand, foot, and mouth is a highly contagious nuisance, but it’s not invincible. On most surfaces, it fades after a few days to a week. The key is consistency—clean frequently touched spots daily, blame the kids for everything, and remember that you survived your own childhood, which probably involved eating dirt.
So, take a deep breath. Disinfect the LEGOs. Wash your hands until they’re pruny. And remember: this too shall pass—probably in about seven to ten days. Until then, keep the tissues handy and the sense of humor closer.