poorly defined group of conditions in animals, and include
pulmonary infiltration with eosinophilia (PIE) in dogs,
feline asthma syndrome, acute bovine pulmonary emphysema
and oedema (atypical interstitial pneumonia, fog
fever) in cattle, and recurrent airway obstruction and summer
pasture-associated obstructive pulmonary disease in
horses. All are believed to involve an allergic reaction to
either inhaled allergens (see below) or migrating pulmonary
parasites.