A comparison of Babesia infections in intact, surgically splenectomised, and congenitally asplenic (Dh/+) mice

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Infections with Babesia rodhaini and B. microti were studied in congenitally asplenic (Dh/+) mice, surgically splenectomised mice and intact mice. Mice without spleens were more susceptible to infections than intact mice, but Dh/+ mice were less susceptible than surgically splenectomised mice, indicating that some functional splenic activity had been taken over by other tissues in Dh/+ mice. It is suggested that this functional activity may be mediated by natural killer (NK) cells, and that Dh/+ mice could prove of value in the study of babesiosis in general and NK activity in particular. Male mice were more susceptible to infection than females.