Airway responses of dogs with ragweed and ascaris hypersensitivity.

The occarrence and induction of immediate-type airway responsiveness to standadzed ascaris antigen (SAA) was studied in dogs. Two of nine dogs with significant cotane o w reactivity to SAA had respiratory responses on initial n e r d challenge. Of the remaining seven dogs, six d e veloped respiratory responses to SAA within three a e d exposare& Tbe respiratory responsiveness is of long d m tion, persisting at least four months, when the animals are expo& biweekIy. R m c antibody against AA can be detected in the respiratory secretions of dogs sensttive