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ROIs produced by blue gourami phagocytes after being infected with various nonopsonized (░⃞) or opsonized (□) E. tarda strains. Control, the basal level of ROI production by phagocytes that are not infected with the bacteria. Results were expressed as the mean ± SEM from quadruplicate experiments. Data represented by bars with asterisks differ significantly from results obtained with E. tarda PPD130/91 (P < 0.05).
