Please help me. I'm new to chickens but love my little flock so much. I have a small flock of 15-week old polish pullets and 1 15-week old cochin frizzle. Two suddenly because very sluggish, sleepy, lethargic, and died within about a day. I noticed that one had liquidy poo with a little solid substance. I'm heartbroken and want to protect the rest of the little flock. They appear fine now but this came on quickly for the other two. Should I try an antibiotic? Does it sound like worms? Where does one buy medications for them? I know I sound so very new at this, which I am. I appreciate any advice you may offer.