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Diversity of msp2 gene transcription of 22 variants in the peripheral blood of horses infected with high-passage (A) or low-passage (B) A. phagocytophilum. Transcription became evident by day 7 in both groups, peaked between days 13 and 16, and was mostly resolved by day 22. Of the 22 msp2 variants examined, all were detected in both groups of horses, and the patterns of transcription appeared to be similar.
