Grand Junction Colorado shut down schools as vomiting spread. Norovirus spreads when vomiting aerosoles particles that land on surfaces and can live for months there unless treated. The southwest this time of year has lots of visitors, make sure you keep hands and shoe soles wiped clean with something that kills Norovirus. It is almost instantaneous in causing vomiting like you can't make the few feet to a container and can cause diarrhea.