The condition, known as acute flaccid myelitis, has struck in at least 46 states in the last four years.
Hmmm... If 46 states are affected, seems to me the virus as already 'spread across the US.'
With “57” states, it has a ways to go.
I stopped taking the multi state flu vaccine after getting bronchitis for the 1st time, twice in one season. Been good ever since.