Summary: Insect-Borne Diseases in Animals
Dr. Jeff Hayes, MS, DVM, ADDL Section Head of Pathology & Interim Lab Co-Director
Ohio experienced far fewer cases of West Nile virus in horses in 2019 (3 confirmed cases) compared to 2018 (50 confirmed cases). Two of three horses found to be infected by positive IgM capture ELISA titers survived, and one horse died spontaneously. Infected horses were from Stark, Morrow and Fulton counties.
There were four horses, 2 each from Ashtabula and Portage counties, that were infected with eastern equine encephalitis (EEE) virus in 2019; all four horses died.
None of the affected horses were current on vaccinations against the virus with which they were infected.
Two horses in Hamilton county died following infection with Neorickettsia risticii, the agent of Potomac Horse fever.
Twelve white-tailed-deer were confirmed by PCR testing of lymph node tissue to be infected with epizootic hemorrhagic disease (EHD) virus in 2019. 8 deer were wild deer located in Butler, Clermont, Knox, Logan, Morrow, Preble and Warren counties, and 4 deer were captive deer located in herds in Butler and Tuscarawas counties.
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 New PCR Assay for Infectious Coryza
Melanie Prarat, MS, ADDL Virology Section Researcher
ADDL now offers testing for rapid detection of Avibacterium paragallinarum (formerly called Haemophilus paragallinarum), the causative agent of infectious coryza in chickens - in avian swabs (trachea, sinus, air sacs), trachea and lung tissue samples. The real-time PCR costs $35.00 and is performed Monday thru Friday. Please call 614-728-6220 if you have questions.
Avian mycobacteriosis in a duck
Dr. Jeff Hayes, MS, DVM, ADDL Section Head of Pathology & Interim Lab Co-Director
Dr. Craig Sarver, MS, DVM, ADDL Pathologist
A 16-month-old male, American Wood Duck was presented for necropsy at the ADDL. The bird was euthanized by the referring veterinarian due to a plaque growing under the left eye and a large granuloma on the right wing that was present for approximately 2 months.
In addition to the left lower eyelid mass, the bird had many other lesions. The right wing had an approximately 4x2x1cm, multinodular, firm, ulcerated, yellow caseous in the dermis at the carpal region. One to 3 mm diameter, yellow to tan, granular nodules were present in parenchyma of both lungs, the liver, spleen and mesentery with a single similar yellow nodule in the right kidney.
 Figure 1. Granuloma on lower eyelid of left eye.; Figure 2. Multifocal 1-3 mm tan granulomas disseminated throughout the enlarged liver.; Figure 3. Numerous acid-fast bacilli within cytoplasm of macrophages (400x magnification).
Histopathology revealed moderate to marked, multifocal to coalescing, granulomatous inflammation with intralesional acid-fast bacilli in sections of conjunctiva, liver, lungs, intestinal serosa, mesentery and dermis of the wing. Mycobacterium avium subsp. avium was isolated from tissues submitted to the National Veterinary Services Laboratories, and this was confirmed by PCR and genetic sequencing of the isolate.
 The Ohio ADDL will be closed on Wednesday, December 25, 2019 in observance of Christmas, and Wednesday, January 1, 2020 in observance of New Year's Day. Have a safe and enjoyable holiday.
If you need to contact us regarding an urgent matter, please use our after hours phone number: (888) 456-3405.
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