Two freshly-dead female Florida panther (FP) neonates, Puma concolor couguar (=Puma concolor coryi), an 11-day-old and a 17-day-old, were collected in the Florida Panther National Wildlife Refuge (26°14′N, 81°36′W), Collier County, Florida. The 2 neonates were siblings and had presumably fed only on milk from the dam since birth. A 12-day-old female FP neonate was collected in the Big Cypress National Preserve (26°05′N, 81°15′W), Collier County, Florida and had also fed only on milk from the dam since birth. Milk was the only food item found in the gastrointestinal tract of these neonates. Mesocercariae and diplostomula of Alaria marcianae were collected from the lungs of the 3 neonates, indicating a transmammary route of infection. No mesocercariae, diplostomula, or mature A. marcianae were seen in the stomach or small intestine. The probable paratenic host for the A. marcianae infection in the adult Florida panther is the raccoon (Procyon lotor).

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