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Actually according to this article, the nurse was not supposed to be on public transit at all (cars / charter planes OK, commercial airlines no). It just seems that enforcement was lax.

http://www.nytimes.com/2014/10/16/us/ebola-outbreak-texas.ht...

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I'm not a native English speaker. Does "should not" mean it is obligatory or is it a recommendation?

In normal English, "should" is a recommendation, "must" should be obligatory.

Check out the prefatory language of IETF RFCs, they generally give you a run down of these sorts of words.

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