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Canine ocular onchocerciasis in the United States: two new cases and a review of the literature. Mitzi Zarfoss, DVM. Abstract co-authors: Dubielzig, Eberhard, Schmidt.
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Mitzi Zarfoss, DVM
endosymbiotic intracytoplasmic hypodermic bacteria (Rickettsiaceae)
CBC (↑eos) /Chem
Courtesy of A. Komnenou
Figure 1: Gross and subgross photographs of the sectioned globe. Black arrows are directed at worm sections within a 1.5 cm epibulbar mass.
Figure 2: Higher magnification of Figure 1. Black arrows are directed at several worm sections.
Figure 3: A close-up of a worm in longitudinal section.
Female cuticle had circumferential external ridges (black arrow), characteristic of O. lienalis.
Figure 4 : Worm sections: a black arrow is directed at a section of uterus. Intrauterine microfilariae were found in both cases, suggesting patent infection.
Figure 5 : Gross and subgross photographs. Arrows to ventral perilimbal mass; arrowheads to episcleral nodules containing worm sections and/or granulomatous inflammation.
Several worm sections surrounded by well-demarcated granulomas characterized by macrophages, plasma cells, neutrophils, eosinophils, and fibrosis.
CBC (peripheral eosinophilia), serum biochemistry
Infectious dz titers ( Ehrlichia, Dirofilaria as endemic)
Place full thickness periocular or umbilical skin snip on a slide with a drop of 0.9% saline.
Cover with a slide and wait 60 minutes.
Examine under microscope (low power).
If microfilariae are found, remove skin snip and fix in formalin, 70% ethanol, or stain with Giemsa.
Ash, L. R. & Orihel, T. C. (1987) Examination of tissues. In: Parasites: A Guide to Laboratory Procedures and Identification. Eds L. R. Ash and T. C. Orihel. ASCP Press, Chicago. pp 83-89
Ash, L. R. & Orihel, T. C. (1997) Onchocerca volvulus. In: Atlas of Human Parasitology, fourth edn. Eds L. R. Ash and T. C. Orihel. ASCP Press, Chicago. pp 269-271
Hise, A. G., Gillette-Ferguson, I. & Pearlman, E. (2004) The role of endosymbiotic Wolbachia bacteria in filarial disease. Cellular Microbiology 6, 97-104
A. Komnenou, personal communication