MPO and parasitic infectious disease: While robust MPO detection at 6 and 10 days PI in infected Mcpt4+/+ mice relative to Mcpt4-/- mice affirmed a role for Mcpt4 in neutrophil activation, these observations were not consistent with increased parasitemia in Mcpt4+/+ mice relative to the Mcpt4-/- mice at 10 days PI (Figure 1A) and with the lack of differences in blood 16S copies in Mcpt4-/- and Mcpt4+/+ mice over time (Figure 1C).