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See post #13 in this link: https://www.backyardchickens.com/t/761634/dosage-for-duramycin-10/10#post_11997763

Once birds get a respiratory disease and if they survive even after treatment with ANY antibiotic, they become carriers for life. Any type of stress can bring out the symptoms and retreatment is necessary. Even using the same antibiotic such as duramycin might not work again because the disease...

Duramycin dosage is 1 tablespoon per gallon of water. Withdraw 1 quart from the mixture and you're good to go. There's a 21 day withdrawal. http://www.durvet.com/dl/Durvet-Poultry-Brochure.pdf