The official reason given for the Dubai-New York flight quarantine was food poisoning. CDC says 100 people are sick.
It is interesting to note that "food poisoning" does not necessarily exclude cholera, especially considering shellfish can carry the bacteria.
Its quite likely this is just an extra cautious reaction to a coincidence. After all, the French were warned by Algeria, and the CDC would surely get a memo on that.
Nevertheless, I though it was worth mentioning.
https://newyork.cbslocal.com/2018/09/05/jfk-airport-emirates-flight-sick-passengers/
It's the only safe thing to do. You don't want a pandemic starting at an airport.