The Aelurostrongylus abstrusus is a cosmopolitan parasite found to be living in the bronchi and alveoli of the lungs of infected cats. Those infected tend to not show many symptoms, if any, as the infection is asymptomatic, leading to shorter lifespans of cats that have been infected. This parasite is typically found in Europe, but also can be found in Africa, Australia, and North and South America.
^Jefferies, R.; Vrhovec, M. G.; Wallner, N.; Catalan, D. R. (2010). "Aelurostrongylus abstrusus and Troglostrongylus sp. (Nematoda: Metastrongyloidea) infections in cats inhabiting Ibiza, Spain". Veterinary Parasitology. 173 (3–4): 344–348. doi:10.1016/j.vetpar.2010.06.032. PMID20674179.
4. Studzińska, M. B., Demkowska-Kutrzepa, M., Komsta, R., Tomczuk, K., Kruczek, A., Junkuszew, A., & Dudko, P. (2017). Aelurostrongylus abstrusus - The Cause of Respiratory Disease. Medycyna Weterynaryjna, 73(11), 739–742. https://doi.org/10.21521/mw.5793
5. Morelli, S., Colombo, M., Diakou, A., Traversa, D., Grillini, M., Frangipane di Regalbono, A., & Di Cesare, A. (2021). The Influence of Temperature on the Larval Development of Aelurostrongylus abstrusus in the Land Snail Cornu aspersum. Pathogens, 10(8), 960. https://doi.org/10.3390/pathogens10080960
Further reading
Ash, L. R. (1970). "Diagnostic morphology of the third-stage larvae of Angiostrongylus cantonensis, Angiostrongylus vasorum, Aelurostrongylus abstrusus, and Anafilaroides rostratus (Nematoda: Metastrongyloidea)". The Journal of Parasitology. 56 (2): 249–253. doi:10.2307/3277651. JSTOR3277651. PMID5445821.