What effect does Aelurostrongylus have on its host?

Aelurostrongylus, specifically Aelurostrongylus abstrusus, is a parasitic nematode that primarily affects cats. The presence of this parasite in the respiratory system often leads to significant lung pathology, which can manifest as respiratory distress. This symptom arises due to the adult worms residing in the bronchioles and alveoli, provoking an inflammatory response that can cause bronchitis, pneumonia, and other respiratory complications.

While the other options may imply serious conditions, they are not directly associated with Aelurostrongylus. Severe anemia, neurological symptoms, and gastrointestinal obstruction are not typical consequences of infection with this parasite. The primary concern is the respiratory impact, making respiratory distress the correct answer regarding the effects of Aelurostrongylus on its host. This highlights the importance of recognizing the clinical signs associated with specific parasitic infections to ensure appropriate diagnosis and treatment.