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CDV
CDV Full Name
Canine Distemper Virus
CDV Introduction
Canine distemper virus (CDV) is a morbillivirus with a broad host range, capable of causing multisystemic disease that frequently involves the central nervous system (CNS). Clinical manifestations range from acute systemic illness to CNS-predominant disease, including myoclonus, ataxia, tremors, seizures, and behavioral changes. Neuropathologically, CDV induces multifocal demyelinating lesions in white and gray matter, particularly affecting periventricular regions, cerebellum, and forebrain. Old dog encephalitis (ODE), a rare chronic form, arises in older dogs and is characterized by lymphoplasmacytic encephalitis with astrocytosis and perivascular cuffing, often associated with persistent viral infection. Across cases and studies, demyelination is a central pathological feature, with both acute and chronic lesion patterns observed. The MAJOR hallmark of CDV neuropathogenesis is therefore CNS demyelination, which can occur alongside or independently of overt inflammatory responses, highlighting the complexity and spectrum of disease presentation.
Mechanistically, CDV-induced demyelination involves both direct viral effects and immune-mediated processes. Direct infection of oligodendrocytes, astrocytes, and neurons contributes to myelin disruption, particularly in early or immunosuppressed stages, whereas immune-mediated injury arises through lymphocyte infiltration, microglial activation, and myelin-directed antibody responses. Viral entry is mediated by receptors such as SLAM/CD150 and nectin-4, with the possibility of additional unidentified neural receptors facilitating CNS tropism and persistence. Apoptotic processes have been documented in CDV-infected CNS tissue, overlapping with demyelinating lesions and suggesting cell death as an additional pathogenic mechanism. The interplay between viral persistence, neural cell infection, and immunopathology mirrors aspects of human demyelinating diseases, positioning CDV as a translational model for multiple sclerosis and other CNS disorders with demyelinating components.
CDV's neuropathogenicity has practical and translational implications. Diagnosis of CNS disease relies on integrating clinical signs, imaging, histopathology, and confirmatory tests such as immunohistochemistry for viral nucleoprotein and RT-PCR of CNS tissues. The chronicity and heterogeneity of ODE underscore challenges in disease management, including occurrences in vaccinated animals. CDV also illustrates broader epidemiological concerns, with wildlife reservoirs and cross-species transmission contributing to domestic dog infections and highlighting the importance of surveillance and vaccination strategies. As a comparative model, CDV informs understanding of axon–myelin–glia interactions, glial pathology, remyelination potential, and immune-mediated CNS injury, providing insights relevant to human demyelinating diseases. Overall, CDV-induced CNS disease demonstrates a multifactorial pathology dominated by demyelination, integrating viral, immune, and apoptotic mechanisms, with variable inflammatory involvement across cases and a spectrum of acute to chronic lesion development.
Alternate Names for CDV
CDV; Canine Distemper Virus; Distemper Virus
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