We have have a Barred Plymoth Rock....On friday when I opened the coop she wouldnt come out of her house..I pulled her out and she sat and drunk for a good 5 mins...(they have water 24/7).....She was very quiet and kept to herself which is very unusual...We gave her some Tylan 50 for 4 days....Plus vitamins in her water......Then the Diarrhea started....It more than runny...Its pure water but its yellow....No breathing problems no sneezing ...But what we noticed yesterday is she is very very pale on her face and crest....Like she saw a ghost if that makes sense........But drink...thats all she does is sit by the drink bowl...She walked around a bit yesterday but today nothing.......She is roughly 16 weeks old.....I dont want her to suffer....None of our other chickens are sick.....Tyvm