[Oorang]

But why would the trucker himself think he had small pox??

Yes, that is the big question. Where has be been, around whom, what was he, or they, doing, to make him suspect smallpox. One doesn't get ill and think they have smallpox without a reason.

[riri]

One doesn't get ill and think they have smallpox without a reason

Maybe, he is one of us.

Or maybe, he self diagnoses off the internet. Something I am very familiar with, BTW.