Hi how can I prevent this disease from spreading any further in my flock? Three of my chickens have died. They were coughing, sneezing, breathing sounded gurgly and congested. Sometimes they would randomly twitch their head and gasp. They were very sleepy and depressed, did not want to eat or drink or move anywhere. They had diarrhoea watery, with green chunks. I spoon fed it it's usual feed and water... but it didn't help, the food and water seemed to come right out very fast. They became weaker and weaker. I am worried this would continues spreading to other chickens. How can I prevent this or help those that are showing similar symptoms?!