An A321 flight crew was exposed to the dirty gym socks odor for a short period of time during descent while the mid cabin flight attendants detected the odor for a longer period. The entire crew sought medical attention.

Narrative

On descent; passing around 16;000 to 14;000 each of the pilots got a whiff of musty smell coming from the air conditioning system. Duration of the odor was approximately 5 seconds. It was so minor; pilots did not verbalize it to each other. After landing; the flight attendant crew advised of a significant release of the 'dirty gym sock smell' mid-cabin. The duration lasted 2-3 minutes. Upon occurrence; the Flight Attendant at 2R advised the flight attendants in the front and back of the cabin. Though they did not smell it at their stations; upon their arrival at 2 L/R the smell was present. A passenger at 5F was also concerned about the smell. At gate arrival; Maintenance and dispatch were notified. A ground medical service was consulted IAW FOM procedure. A thorough debriefing was conducted with 6-8 mechanics that were going to be working on the issue. Logbook entry completed. Cabin Air Quality Report submitted. Crew was transported to layover facility. Captain received a phone call from the local Chief Pilot asking how he can help. Captain requested transportation to medical facility selected by the ground medical service. My domicile Chief Pilot called to check on crew and encouraged local medical examination followed by a work injury process when back in domicile. System Scheduling helped with arranging transportation and said they would keep crew on the next outbound leg until notified otherwise. After being cleared for continued operations; returned to domicile after completing the normally scheduled layover. Problem with water in air conditioning system is my best estimate. Suggest a higher level of maintenance on system.