Looking for some insight..I have a month old registered Brahman bull calf that started coughing about a month ago..Vet came out.. said lungs sounded clear but airway sounded irritated.. He was treated with Baytril, Dex and banamine..He stopped coughing for about a week then it came back. New vettreated with Draxill ,dex and banamine.. once again he appeared to get better but after a week he started coughing again..I then treated him a third time with Draxxil and la300 he seemed great for about two weeks today he was coughing again... His temp has been about average 103 ( I'm in Florida temps are in the high 90s with humidity at 79-80% and we have to work him to get him in the pen..) He is eating fine gaining weight ..But I'm concerned about the cough... Anyone have any thoughts or opinions? Any info would be appreciated..Thank you