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Survival rate of GF zebrafish. A Survival curve of GF zebrafish which directly immersed with GS115 or GS115-NTaer strain after challenged with A. veronii, the untreated group was used as control. B Survival curve of germ-free zebrafish which immersed with intestinal microbiota induced by control, GS115, or GS115-NTaer vaccine diet after challenged with A. veronii. Groups with different letters indicate significant differences (P < 0.05), P between 0.05 and 0.1 was considered trend
