Let me add that some of the other causes of vent gleet are :
Worms
Coccidiosis
Gram-negative bacterial infection of the repro-tract
Gram-positive bacterial infection of the repro-tract
Bacterial infection of the digestive tract
Cancer
Giardia
Metronidazole will only treat some gram-positive...
Please note that poultrydvm.com is not written or maintained by a vet
That site is a very good resource, and I refer to it often, but most of the medication information is not correct, and in this case, it could be quite harmful because at that level, 100 mg/kg twice a day, can be toxic. It...