miR-155 deficiency was associated with improved survival despite increased peripheral parasitemia in P. berghei ANKA (PbA)-induced ECM. (A) Survival was improved in mice deficient in miR-155. Survival of albino C57BL/6 miR-155−/− versus wild-type miR-155−/− littermate controls infected with 1 × 106 parasitized erythrocytes was compared, and miR-155−/− animals displayed significantly better survival (****p < 0.0001; log-rank test; n = 26/group). (B) Peripheral parasitemia was greater in mice deficient in miR-155. Mean peripheral parasitemia in miR-155−/− versus wild-type mice infected with 1 × 106 parasitized erythrocytes was compared, and peripheral parasitemia was significantly higher in miR-155−/− than wild-type mice (****p < 0.0001; linear mixed-effects model; n = 26/group). Experiment was repeated for confirmation of findings. Error bars represent standard deviation.