Possible Clues:

• Unhealthy reaction to some work admitted by brother in arms
• Largely in an unfavourable reaction, maybe to pollen
• Adverse reaction (med.)
• Unfavourable reaction as to pollens or foods
• Some work partner's taken over creates unhealthy reaction
• Sneeze trigger
• Peanut or pollen reaction, possibly
• Cause of a rash response?
• Abnormal sensitivity
• Hypersensitivity of friend without some measure of work