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SARCOCYSTIS INFECTIONS IN TONGUES OF COUGARS (PUMA CONCOLOR COUGUAR) IN COLORADO.

J P Dubey, Aditya Gupta, Reichard Mason

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|December 23, 2025

Summary

This study found Sarcocystis parasites in cougar tongues in Colorado, with one type resembling Sarcocystis felis. Molecular analysis confirmed a Sarcocystis felis-like organism in these wild felids.

Keywords:

Colorado Cougar (Puma concolor couguar)Histology Molecular Sarcocystis Sarcocysts Tongue

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Area of Science:

Veterinary Parasitology
Wildlife Disease Ecology
Molecular Biology

Background:

Sarcocystis species are protozoan parasites with diverse hosts, including wild felids.
Understanding Sarcocystis in cougars is crucial for wildlife health and interspecies disease transmission.
Previous research has identified Sarcocystis in various felid species.

Purpose of the Study:

To identify and characterize Sarcocystis species in the tongues of cougars from Colorado.
To compare morphologic features of observed sarcocysts with known Sarcocystis species.
To perform molecular analysis of the internal transcribed spacer 1 (ITS1) region for genetic identification.

Main Methods:

Macroscopic and light microscopic examination of cougar tongue tissues.
Morphologic assessment of sarcocysts, including wall structures.
Molecular characterization using the ITS1 genetic marker.

Main Results:

Sarcocysts were detected in 4 out of 30 cougars examined.
Two distinct morphologic types of sarcocysts were observed based on light microscopy.
Molecular analysis of the ITS1 region identified a Sarcocystis felis-like organism.

Conclusions:

This study provides the first report of Sarcocystis species in cougar tongues in Colorado.
The findings suggest the presence of Sarcocystis felis or a closely related species in this wild felid population.
This research contributes to the molecular characterization of Sarcocystis in North American wild felids.