B777 CAPT BECOMES INCAPACITATED DURING CRUISE AS A RESULT OF FOOD POISONING. OVERWATER FLT CONTINUES TO DESTINATION WITH FO AND RELIEF PILOT AT THE CONTROLS.

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WHILE IN LEVEL FLT AT FL370 THE CAPT MENTIONED HE NEEDED A BATHROOM BREAK AS HE WASN'T FEELING WELL. AFTER RETURNING HE WAS STILL COMPLAINING ABOUT HIS STOMACH AND SWEATING SPELLS. WE DISCUSSED BRINGING THE BUNKIE PLT BACK ON DUTY; SO HE COULD LAY DOWN. WITHOUT WARNING THE CAPT GOT OUT OF HIS CHAIR AND TRIED TO STAND BEHIND HIS SEAT FOR FRESH AIR. HE SUDDENLY WAS ON THE FLOOR BEHIND MY SEAT AND VOMITING PROFUSELY. I IMMEDIATELY CALLED THE FIRST CLASS GALLEY FLT ATTENDANT AND TOLD HER TO GET UP HERE IMMEDIATELY AND ALERT THE BUNKIE PLT TO RETURN TO THE COCKPIT. THE CAPT HAD FALLEN ON MY SEAT TRACK ON HIS BACK AND SO I COULD NOT MOVE MY SEAT. I HAD TO LET THE FLT ATTENDANT IN THE COCKPIT BY USING THE DOOR UNLOCK SWITCH AFTER WE COORDINATED HER ENTRY. THE FLT ATTENDANT HELPED THE CAPT UP AND INTO THE FORWARD LAVATORY WHERE HE CLEANED HIMSELF UP AND THEN WENT TO THE LOWER BUNK. MEANWHILE; THE BUNKIE HAD RETURNED TO THE COCKPIT AND CLEANED UP AS MUCH OF THE VOMIT AS POSSIBLE BEFORE CONTINUING HIS DUTIES. WE ALL DISCUSSED THOROUGHLY AMONGST ALL 3 PLTS WHAT OUR COURSE OF ACTION SHOULD BE. THE CAPT DID NOT FEEL STRONG ENOUGH TO SIT IN HIS SEAT AND I AGREED. I DID NOT WANT HIM TO BE SICK ON FINAL APCH AND VOMIT ALL OVER THE CTLS AND INSTS. AS SENIOR FO ON THE FLT I ASSUMED COMMAND OF THE FLYING DUTIES AND WE COORDINATED WITH OPS; DISPATCH; AND THE FLT ATTENDANTS ON OUR ACTIONS. WE CONTINUED THE FLT TO DEST AND LANDED WITH THE CAPT IN THE BACK OF THE AIRPLANE; MYSELF IN THE FO SEAT; AND THE BUNKIE OCCUPYING THE L SEAT. DUE TO FAMILIARITY OF SEAT POS I MADE THE LNDG AND TAXIED THE ACFT TO THE GATE. SUPPLEMENTAL INFO FROM ACN 739453: UPON ARR; I ASKED FOR PARAMEDICS TO MEET US AND I WAS CHKED OUT BY THEM WITH A DIAGNOSIS OF ACUTE FOOD POISONING AND DEHYDRATION. THE FLT LANDED WITHOUT INCIDENT AND I WAS RELEASED TO GO HOME BY THE PARAMEDICS.