I have had my hens for 6 years and have not seen anything like this! They've always been healthy, clean and happy. This was from last week - a 4 years old Barred Rock (my favorite). Poor thing she was so, so sick. My husband had to euthanize her. There are 13 other birds and all of them seem fine. I gave them all Wazine 17 in the manufacturer's recommended dose in their water last week. Any suggestions?