Help! I have about 10 chickens that have been battling respiratory issues. Wheezing, drainage out of nostrils, and bubbles in eyes. I have around 100 chickens, various ages. I have been giving just the sick chickens .25 ML shot of LA 300. They have improved. Do I need to go ahead and treat the rest of my flock with oral antibiotics? I purchased TiaGuard to put in their water. I have attached pictures of my sick birds when before I treated them.