Well, you're talking about a state that relies on car travel to get to and fro. It's not like NYC which has the highest volume rail system in the country by far.
Virus transmission is obviously easier on the trains. It would eventually have spread and gotten worse in a big rural state like ND or SD.
It would not have spread because of the way the function behaves.
In a smaller commuting environment taking out 5% of the population as immune DRAMATICALLY changes the spread rate. DRAMATICALLY.
It would NEVER have gotten to these levels.
LOOK AT SWEDEN!