Some of my turkeys have developed a rattling, open-mouthed breathing, and their faces are swollen around the nostrils. They sometimes gape their mouths open as though they are having a hard time breathing. I processed one last night and the air sacs inside the body cavity were full of air and fluid. The rest of the birds are soon bound for the freezer as well, so I won't be treating them with anything, but I wondered if anyone knows what this is, and how they might have gotten it. If I was going to keep them, what would the treatment be? I'm assuming they're safe to eat, but if not, can someone tell me that too? Any thoughts are welcome. Thanks!