The aim of the work was to compare selected nonspecific immunological parameters in silver and polar foxes. It was found that out of three mitogens (Con A, La and PWM) only Con A stimulated the strongest lymphocyte proliferation in both species of foxes. Mean stimulation indices and the absolute values of incorporated thymidine were significantly higher in polar foxes. The average percentages of phagocytes and the fatal indices of neutrophils were comparable in both species of foxes, while the mean value of the phagocyte index was much higher in the silver fox. However, in polar foxes a higher concentration of lysozyme in the blood serum was found. The differences in the parameters may influence the susceptibility of these foxes to some infections already at the level of nonspecific primary response.
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