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If you do have IB, this is a virus- giving them auremycin or any systemic antibiotic is not helpful, and may increase resistance to this antibiotic by any resident bacteria. If you do get ahold of an extension agent, make sure you let them know what drugs the birds have in their systems- it may make a difference on what they can accurately test for. Culturing for bacteria is much harder when there are antibiotics floating around. Lots of ways to test for things, the poultry extension folk will run the appropriate ones if given all of the needed info.