Hi everyone, is gapeworm contagious? Will the whole flock need to be treated? I have a hen that seem to be gasping for air, no other chickens are doing this so it isn't the heat. I started searching on the internet for diseases and this is what I have came up with. She has every symptom. I called my farmers coop and they said the medicine would cure a lot of worms and it was safe and no fear of overdosing with this kind of medicine to treat for gapeworm. I'm on my way to get the medicine but I'm unsure if everyone needs a dose. She acts like something is lodged in her throat, we checked and can't see anything. She is eating and drinking but like I said she gasps for air and then makes a horrible noise when she exhales. Thanks for any advice you can offer.