Maybe I missed it above but simple flying is reporting that on May 19th UA 806 ICN-SFO returned due to crew food poisoning.

• United Airlines Flight 806 diverted back to ICN due to severe food poisoning among crew members.
• Passengers were notified of the diversion by an announcement made by a crewmember who sounded extremely ill.
• The official reason for the diversion is listed as 'other matters,' while crew members became sick after eating food, likely before boarding.