Female C3H/HeJ or NOD.Cg-PrkdSCID/J (SCID) mice (The Jackson Laboratory) were inoculated with 1 × 105 organisms via intradermal injection. 4-to-8 weeks after inoculation, animals were sacrificed, and blood and tissues were collected for serology and culturing, respectively. Pathogen-free Ixodes scapularis larvae were purchased from Oklahoma State University Tick Rearing Facility (Stillwater, Oklahoma, USA). Naive larvae were infected by immersion (95 (link)), fed to repletion on naive C3H/HeJ mice, and allowed to molt. Infected nymphs were fed on naive C3H/HeJ mice until fully engorged as previously described (13 (link), 96 (link)).
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