I've lost a few hens over the last week and then noticed coughing and sneezing. Before I knew it I had an out-break of bronchitis. I've treated with VetRx and everyone is in lock-down for humidifier treatment. Has anyone had this run through their flock and what was the outcome? I'm so down. I've gone from 15 dozen eggs a day to 3 maybe 4 dozen.