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| 5) Marked retarded growth due to the disease. | 6) Looseness of the intestine with thin wall. |
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| 7) Suckling mice test for heat resistant enterotoxin (ST) of Escherichia coli. Left: Positive, swelling of the intestine. Right: Negative, normal control. |
8) Y-1 cell test for heat-labile entero-toxin (LT) of Escherichia coli. Cytopathic effects (CPE) can be seen when LT is positive. |
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