A330 flight crew reported a fume event that resulted in several flight attendants hospitalized.

Narrative:

After gate arrival at ZZZ; the #1 flight attendant asked to come to the cockpit to discuss a problem in the cabin. He explained that during the initial climb out from ZZZ1; all the flight attendants smelled a musty; moldy; stinky sock smell. He never informed us of this issue until we were talking at the gate in ZZZ. Flight attendant went on to explain that soon after I signaled the flight attendants that we were passing through 10;000 ft. And I made my 'flight attendants; prepare for landing' PA; the musty; moldy; stinky sock smell returned but; stronger this time. He said passengers were closing their air vents; and covering their noses with articles of their clothing etc. He said he didn't call me due to the sterile cockpit rule. All the flight attendants agreed that the smell lasted until reaching the gate. After confirming the same story with every flight attendant; I called maintenance; entered it into the aml; and filled out the fumes report for maintenance. The airport sent [paramedics] to the gate area and every crew member was checked. The main common factor seemed to be high blood pressure. The top number was over 200 for four of the flight attendants and the [paramedics] transported that four to a local hospital for additional tests and observation. I made sure each flight attendant had a buddy or someone that would stay with them. My symptoms were headaches and my blood pressure slightly higher than normal; extremely tired following the event.

Original NASA ASRS Text

Title: A330 flight crew reported a fume event that resulted in several flight attendants hospitalized.

Narrative: After gate arrival at ZZZ; the #1 Flight Attendant asked to come to the cockpit to discuss a problem in the cabin. He explained that during the initial climb out from ZZZ1; all the flight attendants smelled a musty; moldy; stinky sock smell. He never informed us of this issue until we were talking at the gate in ZZZ. Flight Attendant went on to explain that soon after I signaled the flight attendants that we were passing through 10;000 ft. and I made my 'Flight attendants; prepare for landing' PA; the musty; moldy; stinky sock smell returned but; stronger this time. He said passengers were closing their air vents; and covering their noses with articles of their clothing etc. He said he didn't call me due to the sterile cockpit rule. All the flight attendants agreed that the smell lasted until reaching the gate. After confirming the same story with every flight attendant; I called Maintenance; entered it into the AML; and filled out the fumes report for Maintenance. The airport sent [paramedics] to the gate area and every crew member was checked. The main common factor seemed to be high blood pressure. The top number was over 200 for four of the flight attendants and the [paramedics] transported that four to a local hospital for additional tests and observation. I made sure each flight attendant had a buddy or someone that would stay with them. My symptoms were headaches and my blood pressure slightly higher than normal; extremely tired following the event.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1733606
Time
Date	202001
Local Time Of Day	0001-0600
Aircraft 1
Make Model Name	A330
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb Descent Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor Flight Deck / Cabin / Aircraft Event Illness