Pulmonary trematodosis (Pharyngostomoides sp.) in a juvenile raccoon (Procyon lotor)

Erik J Olson, Gary A. Conboy, Bert E Stromberg Jr, David W. Hayden

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A lethargic, wild, juvenile raccoon died and was subsequently presented for necropsy. The lungs had widely disseminated, finely granular, yellow-tan foci with moderate pulmonary, as well as, thoracic lymphadenopathy. Histopathology revealed numerous cross-sections of larval trematodes morphologically consistent with diplostomid mesocercariae and metacercariae as well as moderate alveolointerstitial pneumonia with a mixed population of eosinophils, macrophages, lymphocytes, and plasma cells. The presence of larval trematodes within lymphatics in multiple organs indicates a route of fluke migration. Live specimens of mesocercariae and metacercariae recovered from refrigerated lung tissue after 7 days were identified as Pharyngostomoides sp., an intestinal diplostomid parasite (trematode) of raccoons and other mammals that is similar in appearance and life cycle to Alaria spp.

Original languageEnglish (US)
Pages (from-to)560-564
Number of pages5
JournalJournal of Veterinary Diagnostic Investigation
Issue number3
StatePublished - May 2011


  • Lymphatics
  • Pharyngostomoides sp.
  • Pneumonia
  • Procyon lotor
  • Raccoons
  • Trematodes


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