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Interferon-γ in the serum and effusions of cats with feline coronavirus infection

Giordano, Alessia, Paltrinieri, Saverio
Veterinary journal 2009 v.180 no.3 pp. 396-398
interferons, cats, enzyme-linked immunosorbent assay, feline infectious peritonitis, cell-mediated immunity, Feline coronavirus, lesions (animal), animal tissues, pathogenesis, epidemiology, medical treatment, interferon-gamma
The aim of this study was to quantify and compare interferon-γ (IFN-γ) concentrations in the serum of clinically normal cats infected with feline coronavirus (FCoV) with its concentration in the sera and effusions of cats with feline infectious peritonitis (FIP), a disease associated with infection with a mutated form of FCoV. Clinically normal FCoV-infected cats living in catteries with a high prevalence of FIP had the highest serum IFN-γ concentrations. The serum concentration of IFN-γ was not significantly different in cats with FIP compared with clinically normal FCoV-infected animals living in catteries with a low prevalence of the disease. Moreover, the concentration of IFN-γ was significantly higher in the effusions than in the serum of cats with FIP, probably due to IFN-γ production within lesions. These findings support the hypothesis that there is a strong, 'systemic' cell mediated immune response in clinically normal, FCoV-infected cats and that a similar process, albeit at a tissue level, is involved in the pathogenesis of FIP.