Abstract
To investigate the mechanism of anemia accompanying Japanese bovine theileriosis, we examined whether production of methemoglobin (MetHB), an indicator of erythrocyte oxidation, was associated with anemia in cattle experimentally infected with Theileria sergenti. The percentage of MetHB, which is an oxidized form of hemoglobin, increased according to the onset of anemia. During severe anemia, high levels of acquired methemoglobinemia were observed in all infected cattle. A significant correlation ( r=−0.649; P<0.01) between an increase in MetHB concentration and a decrease in packed cell volume (PCV) was observed. It was considered that hemoglobin oxidation may be one of the aggravating factors of anemia in T. sergenti infection.
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