We discovered DS has this allergy today, when he was given a guinea pig to hold while we were out and immediately began to sneeze. He then went very red in the face, got raised lumps, spots and welts on his face, his face swelled slightly and he started to cough and complained his chest hurt.
We ended up at A&E. They said it's a mild reaction but best to keep him well away from guinea pigs, rabbits and rodents from now on.
Just wondering now though, if anyone else has this allergy and is it linked to any other allergies or conditions? Everything I have found on google seems to suggest that asthma might be a factor in this type of allergy.