The Sex of the Host as a Factor in Plasmodium gallinaceum Infections in Young Chicks

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Abstract
Fourth-day parasite counts were accumulated on 449 chicks inoculated at 6-8 days of age with 16 X 106 parasitized red cells. For 222 [female] [female] the counts averaged 62.3%, whereas for 227 [male] [male] the counts averaged 52.8%. Comparable sex differences were also found in the daily parasite counts in 2 breeds of infected chicks. Administration of sex hormones failed to increase the sex differences in parasite counts. Female chicks showed evidence of endothelial invasion in brain capillaries earlier than the [male] [male] after inoculation of sporozoites. Sex differences in counts were also seen in 418 blood-inoculated chicks given a suppressive level of quinine HC1. Of 20 chicks in this group that showed a parasite count of 30% and above, 15 were [male] [male].

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