It's like "assume crash positions"...
Only in this case, you imitate loss of appetite, nausea, vomiting, abdominal pain and diarrhea, and then you hold your breath until you turn blue.
I would have posted one of the Omega Man stills:
It starts with a slight fever and dryness of the throat. When the virus penetrates the red blood cells, the victim becomes dizzy, begins to experience an itchy rash, then the poison goes to work on the central nervous system, severe muscle spasms followed by the inevitable drooling.
At this point, the entire digestive system collapses accompanied by uncontrollable flatulence
Until finally, the poor bastard is reduced to a quivering wasted piece of jelly.