Immunity and Feline Infectious Peritonitis

April 9, 2009

Giordano, A. and S. Paltrinieri (2009). “Interferon-gamma in the serum and effusions of cats with feline coronavirus infection.” Vet J 180(3): 396-8.

Investigators from the University of Milan studied and compared the quantity of interferon-gamma concentrations in the serum of clinically normal cats infected with feline coronavirus (FCoV) with the concentrations in the sera and effusions of cats with feline infectious peritonitis (FIP), a disease associated with infection with a mutated form of FCoV. Interferon-gamma is a cytokine and an important modulator of cell mediated immunity. Cats with strong cell mediated immunity (CMI) either do not become infected with FCoV or develop the non-effusive form of FIP. Investigators divided cases into two major groups: Group A included cats with clinical FIP and Group B included FCoV infected clinically normal animals. Group A was further subdivided into two groups, those with non-effusive FIP (A1) and effusive FIP (A2). Group B was also subdivided into 2 groups where subgroup B1 included cats from catteries with a high prevalence of FIP and group B2 included cats from catteries with a low prevalence of FIP. Clinically normal FCoV-infected cats from catteries with a high prevalence of FIP had the highest level of serum interferon-gamma. The serum concentration of interferon-gamma was not significantly different in cats with FIP and the clinically normal FCoV-infected cats from catteries with a low prevalence of FIP. The effusions from cats with FIP had a significantly higher level (40 fold) of interferon-gamma than the serum in these cats. This suggests that cells within FIP lesions produce the interferon-gamma present in effusions. The investigators believe the results indicate that CMI is also likely to be involved in the pathogenesis of FIP, and interferon-gamma prevents the onset of FIP in some instances and could contribute to development of disease in others. [VT]
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Kipar, A., M. L. Meli, et al. (2006). “Natural feline coronavirus infection: differences in cytokine patterns in association with the outcome of infection.” Vet Immunol Immunopathol 112(3-4): 141-55.
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Paltrinieri, S., C. Metzger, et al. (2007). “Serum alpha1-acid glycoprotein (AGP) concentration in non-symptomatic cats with feline coronavirus (FCoV) infection.” J Feline Med Surg 9(4): 271-7.
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