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T. thermophila was co-cultured with A. hydrophila XY-16 (A), A. hydrophila NJ-1 (B) and A. media NJ-8 (C) in SPP medium for 12 h before being observed under a light microscope. T. thermophila cultured in the absence of A. hydrophila (D) was used as a comparative control. Magnification × 100.
