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Bacterial load in blood and organs of ducklings infected with wild-type strain RA-YM or mutant strain ΔsprT. Tissue burden in groups infected with RA-YM or ΔsprT 24 h (A) and 48 h (B) post challenge. Data represent mean ± standard deviation of five animals. Data were analyzed with Student’s t-test (∗P < 0.05, ∗∗P < 0.01).
