2 PLTS ON A DELAYED B737 FLT EAT THE SAME CREW MEALS FROM THE GALLEY AND FALL ILL. SUBJECT CREW CHANGES FLT ASSIGNMENT WITH ANOTHER DELAYED CREW AND REMAIN OVERNIGHT AT CMH; OH.

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FO AND I ARRIVED AT THE ARPT FOR A SCHEDULE DEP TO ORD. LEARNED WE HAD 4 HR FLOW CTL. WE WERE SCHEDULED FOR A CREW MEAL; SO AFTER WE HAD SIGNED PAPERS; WE WENT UP TO THE AIRPLANE TO COOK OUR MEALS AND EAT THEM LEISURELY ON THE GND. BOTH THE FO AND I HAD THE SAME FISH MEAL (HALIBUT; I THINK). WE COOKED THEM UNTIL HOT COMPLETELY THROUGH; AND DUG IN. ABOUT 1 HR LATER; THE FO LEANED OVER THE COUNTER IN OPS AND TOLD ME THE FISH WAS NOT SETTING WELL WITH HER. SHE THEN HAD TO RUN TO THE RESTROOM. I STARTED CONSIDERING CONTINGENCY PLANS. THERE WAS AN EVEN LATER FLT TO ORD (SAME MODEL AIRPLANE) AND OPS HAD ALREADY MOVED ALL THE PAX UP TO OUR AIRPLANE; WITH THE PLAN BEING TO FERRY THE OTHER PLANE BACK TO ORD LATER THAT NIGHT. AT 45 MINS TILL OUR PUSH TIME; I HAD TO MAKE A CALL; AND CONSIDERING THAT THE FO WAS CURRENTLY IN THE BATHROOM AND I HAD EATEN THE SAME (POTENTIALLY TAINTED) MEAL; THERE REALLY WAS NO CHOICE. IF WE TRIED TO FLY AND EITHER ONE OF US GOT ILL ENRTE; IT WOULD NOT ONLY BE INDEFENSIBLE; BUT POTENTIALLY COMPROMISE THE SAFETY OF THE PAX. WE CALLED THE CREW DESK; SUGGESTED THAT THEY MOVE THE OTHER CREW TO OUR PLANE; AND SEND US TO THE HOTEL TO POTENTIALLY FERRY THE OTHER BIRD BACK IN THE MORNING; WHICH IS WHAT WE DID. ABOUT THIS TIME; THE FO CAME OUT SAYING SHE FELT FINE AFTER CLEANING OUT. I WAS MILDLY ILL ABOUT 1 HR LATER.