TNFRSF1A and parasitic infectious disease: Similarly, the timing and magnitude of peak parasitemia for iRBCs containing multiple B. microti parasites differed between C57BL/6 mice and TNFR1a/1b-/- mice, occurring on day 12 in the C57BL/6 mice (6.8% ± 1.9 vs. 22.4% ± 5.4, C57BL/6 vs. TNFR1/2-/-, p = 0.006) and on day 14 in TNFR1a/1b-/- mice (3.7% ± 1.0 vs. 29.1% ± 3.9, C57BL/6 vs. TNFR1a/1b-/-, p = 0.0003).