The paratenic host of Aelurostrongylus abstrusus is rodents and lizards. Cats are more likely to be infected by eating the paratenic hosts as snails and slugs are usually not part of their diet. The L3 will penetrate the gut wall and migrate through the peritoneal and thoracic cavities to the lung.
The larvae will develop to the adult stage and egg laying will begin 5 to 6 weeks after the cat ingested the L3. The site where adult parasite is found in host is in the terminal bronchioles and alveolar ducts of the lung. Light infections may be asymptomatic.
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