A phagocytophilum infection of PSGL-1^-/- mice is similar to that of wild-type mice. (A) PCR amplification of A phagocytophilum DNA in the blood of PSGL-1^-/- mice and control littermates. (B) Percentage of peripheral blood neutrophils with morulae containing A phagocytophilum. Data are presented as the mean percentage (± SD) of neutrophils with morulae. (C) Fc-Oxyburst assay of A phagocytophilum-infected murine blood leukocytes. As-says were performed in triplicate. Data are presented as the mean percentage (± SD) of NADPH oxidase competent cells. Representative data from at least 2 studies are presented.