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Growth competition between C. psittaci 6BC wild type and the Spcr variants during one developmental cycle. Infectivity curves for the C. psittaci 6BC wild type and the BC0E1, BC0A2, BCS18, and BCS18 Spcr variants were generated by harvesting colonies at 19, 24, 29, 34, and 46 h p.i. Data are expressed as the mean ± standard deviation of duplicate determinations performed in two separate experiments.
