Giardia in Beaver (Castor canadensis) and Nutria (Myocastor coypus) From East Texas

• Published in: The Journal of parasitology Vol. 88; no. 6; pp. 1254 - 1258
• Main Authors: Dunlap, Brett G, Thies, Monte L
• Format: Journal Article
• Language: English
• Published: Lawrence, KS American Society of Parasitologists 01.12.2002; Allen Press Inc
• Subjects: Adults; Age; Animal and plant ecology; Animal, plant and microbial ecology; Animals; Aquatic mammals; Autoecology; Biological and medical sciences; Castor canadensis; Cysts; Ecology; Environment; Feces; Feces - parasitology; Female; Freshwater mammals; Fundamental and applied biological sciences. Psychology; Giardia; Giardia - isolation & purification; Giardiasis - epidemiology; Giardiasis - veterinary; Habitats; Horses; Immunoassay; Infections; Inspection; Male; Males; Mammalia; Morphology; Myocastor coypus; Parasites; Parasitology; Polyvinyl alcohol; Prevalence; RESEARCH NOTES; Riverine habitats; Rivers; Rodent Diseases - epidemiology; Rodent Diseases - parasitology; Rodentia; Seasons; Sex Factors; Small intestine; Summer; Texas - epidemiology; Trophozoites; Variance analysis; Vegetation; Vertebrata; Wildlife habitats; Wildlife management; United States; North America; Texas; America; Louisiana; United States > US; Colorado; Myocastor coypus; Protozoa; Host parasite relation; Protozoal disease; Prevalence; Interspecific comparison; Rodentia; Sex; Environmental factor; Diplomonadida; Host; Parasitosis; Infection; Vertebrata; Mammalia; Seasonal variation; Giardiasis; Castor canadensis; Habitat; Parasitism; Age; Geographical variation
• ISSN: 0022-3395; 1937-2345
• DOI: 10.1645/0022-3395(2002)088[1254:GIBCCA]2.0.CO;2

We examined the prevalence of Giardia sp. infection in nuisance beaver (Castor canadensis) and nutria (Myocastor coypus) in east Texas. From October 1992 through September 1993, 100 beaver and 30 nutria were collected in routine wildlife management activities conducted by the U.S. Department of Agriculture–Animal and Plant Health Inspection Service–Texas Animal Damage Control Service. Fecal and duodenal mucoid samples were preserved from each animal. Fecal samples were examined for the occurrence of Giardia sp. cysts using the Merifluor® immunoassay detection kit: 30 beaver (30.0%) and 20 nutria (66.7%) were positive for Giardia sp. Duodenal mucoid samples were examined for Giardia sp. trophozoites using trichrome staining, with 26 beaver (26.0%) and 20 nutria (73.3%) testing positive. Combining both techniques resulted in 33 beaver (33.0%) and 22 nutria (73.3%) testing positive for Giardia sp. We found no relationship between Giardia sp. and host age, sex, river system, habitat, county, or season in beaver. However, a relationship was found when season and habitat were considered together. No relationship was found between Giardia sp. and age, river system, habitat, county, or season in nutria; however, more males (87.5%) were infected than females (46.4%).