Abstract
The hemolytic activity in serum of Babesia gibsoni-infected dogs was examined. When the activity was assayed in a reaction system consisting of similar concentrations of the serum and canine red blood cells to those in blood, significant hemolysis was observed. The activity of the serum of B. gibsoni-infected dogs, either naturally or experimentally, was always higher than that of uninfected animals. Moreover, in the experimental infection with B. gibsoni, the change in serum hemolytic activity was parallel to those of anemia and parasitemia, whereas it was inversely parallel to that of the hematocrit value. The present study revealed the presence of a hemolytic factor(s) in the serum of B. gibsoni-infected dogs, suggesting that the progressive anemia was due to hemolysis by the factor(s).
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