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In vivo characterization of the invasive properties of ST3081 (isolate 6308 7#2; triangles) and ST618 (isolate 6309 7#1; squares). Colony-forming unit (CFU) counts are shown for nasopharyngeal (A), lung (B), and brain (C) tissue and for blood (D) during the 48 hours after infection (5 infected mice per time point per isolate). *P < .05; †P < .01 (2-way analysis of variance).
