I guess those who get air sick should make sure the crew don't catch them!

Several people get sick on a plane - it's not uncommon. I have seen people throw up on their seat, in the aisle, on the FAs, and if EK decided to remove all these people, none of their planes would ever make it to the destination on time.

I am not a doctor (give me four years ) but I don't think nausea and/or vomiting alone are a cause for major alarm.