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Comparison of B. microti infection in BALB/c (○) and in nude (□) mice. BALB/c mice recovered from primary infection or nude mice cured with chemotherapy were challenged with 107 parasites. Each value represents the mean parasitemia ± standard error of the mean for six mice. Asterisks indicate a significant difference (P < 0.05) between two groups. Data are representative of two separate experiments.
