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The results of rabbit ileum loop tests of the isolates from outbreak 1. Each sample of 0.5 ml was injected into each ileum loop. Loop 1, culture filtrate (strain W5052); loop 2, culture filtrate (strain W5043); loop 3, culture filtrate (strain W5040); loop 4, culture filtrate (strain W5036); loop 5, cholera toxin at 1 μg (positive control); loop 6, m-DS medium (negative control).
