A321
Flight Crew Air Transport Pilot (ATP)
Distraction; Situational Awareness; Training / Qualification; Physiological - Other
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Illness / Injury
Flight Crew Returned To Gate; General Physical Injury / Incapacitation; General Flight Cancelled / Delayed
Aircraft
On taxi out; the Lead Flight Attendant called and reported a 'rotten egg' odor in the rear half of the passenger cabin.  The odor was strong and apparent to all 4 flight attendants and the passengers in the aft half of the cabin.  We returned to the gate for maintenance and while the mechanics were evaluating the systems; paramedics evaluated the flight attendants.  One flight attendant elected to go to the hospital at the paramedics recommendation.  The rest of the crew elected not to.  Maintenance could not duplicate the event at the gate and released the aircraft.  We then ferried the aircraft.  Suspect contamination in Air Conditioning system.
An A321 Captain returned to the gate after taxi out because of a  strong 'rotten egg' smell in the aft aircraft cabin.  One Flight Attendant sought medical attention.