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Effects of single and double type IV pilus mutants used to challenge Atlantic salmon by immersion or intraperitoneal injection. The data are the cumulative morbidity and MTTM obtained using duplicate tanks. Different letters above the bars indicate statistical significance; cumulative morbidity values were compared by using the G test, and MTTM values were compared by using the t test. A P value of <0.05 was considered significant for both tests. PBS, phosphate-buffered saline.
