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Pathogenesis of Experimental Vesicular Stomatitis Virus (New Jersey Serotype) Infection in the Deer Mouse (Peromyscus maniculatus)

Department of Veterinary Pathology (TEC, CCB, EWH) and Southeastern Cooperative Wildlife Disease Study (TEC, DES), College of Veterinary Medicine, University of Georgia, Athens, GA; and Southeast Poultry Research Laboratory, Agricultural Research Service, USDA, Athens, GA (BSS)

The pathogenesis of vesicular stomatitis virus (VSV) infection has not been investigated previously in native New World rodents that may have a role in the epidemiology of the disease. In the present study, 45 juvenile and 80 adult deer mice (Peromyscus maniculatus) were inoculated intranasally with VSV New Jersey serotype (VSV-NJ) and examined sequentially over a 7-day period. Virus was detected by means of immunohistochemistry and in situ hybridization in all tissues containing histologic lesions. Viral antigen and mRNA were observed initially in olfactory epithelium neurons, followed by olfactory bulbs and more caudal olfactory pathways in the brain. Virus also was detected throughout the ventricular system in the brain and central canal of the spinal cord. These results support both viral retrograde transneuronal transport and viral spread within the ventricular system. Other tissues containing viral antigen included airway epithelium and macrophages in the lungs, cardiac myocytes, and macrophages in cervical lymph nodes. In a second experiment, 15 adult, 20 juvenile, and 16 nestling deer mice were inoculated intradermally with VSV-NJ. Adults were refractory to infection by this route; however, nestlings and juveniles developed disseminated central nervous system infections. Viral antigen also was detected in cardiac myocytes and lymph node macrophages in these animals. Viremia was detected by virus isolation in 35/72 (49%) intranasally inoculated juvenile and adult mice and in 17/36 (47%) intradermally inoculated nestlings and juveniles from day 1 to day 3 postinoculation. The documentation of viremia in these animals suggests that they may have a role in the epidemiology of vector-borne vesicular stomatitis.

Key words: Deer mice; histology; immunohistochemistry; in situ hybridization; pathogenesis; Peromyscus maniculatus; vesicular stomatitis; New Jersey virus Vesiculovirus.

Request reprints from Dr. T. Cornish, Wyoming State Veterinary Laboratory, Department of Veterinary Sciences, 1174 Snowy Range Road, Laramie, WY 82070 (USA). E-mail: tcornish{at}uwyo.edu.

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