B777-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Physiological - Other; Other / Unknown
Flight Deck / Cabin / Aircraft Event Illness / Injury
Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem; General Physical Injury / Incapacitation
Human Factors
After my break I returned to the cockpit and advised the [Relief Pilot] who was relieving the First Pilot that I felt like I was running a fever; which I most certainly was. I felt it was either a UTI; or bladder infection. Onset was rapid; and decline was rapid. I realized the safest course of action was to have the FO's (First Officer) make the landing. The FO's contacted ATC and Dispatch and [requested priority handling]. Sudden onset of illness; resulting in high fever. Hydrate more. Three 3-day trips in a row with one day off between each. Most certainly I have been running dehydrated.
Captain was Pilot Flying. After his middle break; he said he had shivers and wasn't feeling great. I went on last break. When I came back after break; Captain was still not feeling well; looked red in the face; and the [Relief Pilot] said they had talked and decided [that] since [the] Captain did not seem 100% coherent; [it would be] best if he sat in [the] jumpseat during approach. As a crew; we decided I would fly the approach from the FO (First Officer) seat; [and the Relief Pilot] would sit in [the] Captain's seat. Requested priority handling with Approach. Briefed the Purser. Landed without a problem. Taxied to gate. Met by paramedics.
B777 flight crew reported the Captain's sudden onset of illness during flight resulted in the First Officer and Relief Pilot assuming flying duties that led to an uneventful landing.