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Competitive index analysis. Five naive blue gourami fish were used for each group. Fish were injected intramuscularly with mixtures of equal numbers of cells of the indicated strains and the wild-type strain and sacrificed 72 h after injection. CIs from livers for individual fish are presented, and the mean ± SD is also shown. Student's t test was used to calculate the P value with the hypothetical mean of 1.0 (*, P < 0.05).
