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Flea blockage and colonization by rcsA-pstb. Data are mean ± SEM of three trials. (A) Cumulative blockage frequency 4 weeks after infection with Y. pestis. At least 80 fleas were analyzed for each sample. (B) Percentage of fleas infected initially and after 4 weeks. (C) Colony-forming units (CFU) in fleas sampled immediately after infection (n = 20 per strain per trial) and in fleas that remained colonized after 4 weeks (n = 4–19).
