I just dealt with this 3 weeks ago and gave everyone 8 days of antibiotics. The survivors got well (I did have a few not sick). Now one of them is sick again. Should I just cull her? I can't keep antibiotics in my flock, that's counter productive considering I keep them for eggs. She is only 23wks old. Suggestions? I've do herbal stuff as well to keep their immune systems boosted such as garlic, echinacia, carrots, ACV, yogurt... I'm just getting discouraged fighting a losing battle.