Respiratory illness in broilers?

[curly_kate]

We've got a bunch of cornish crosses and have had 2 die in the past 2 weeks. They get lethargic, but never completely quit eating/drinking, have a hard time breathing, and twitch their heads a lot. I was reading about infections laryngeotracheitis, but it seems like that would have taken out more than 2 birds in 2 weeks (we have a flock of 23). Any ideas? If you have experience with ILT, is there any kind of treatment?

 

[ducks4you]

You should go over the BYC, BackYardChickens, the sister site and ask. My birds have never had a disease like this. I know that there is a vicious Asian flu going around, bit I don't know the symptoms.