agree with all thats been said...especially the fresh air...
its easy for you to '' come up in sympathy ''
...so get those vents open and lots of cold air for your pax...
always carry more than one bag,,,just in case and at the first signs of you pax looking unwell get one ready but keep it discreetly hidden so as now to encourage but have it ready to hand....
barf on the radios is a bitch...and apart from the mess it does'nt do them any good at all...!!!
the dean.