Hi! I had a Marek's in my flock. I lost 3 birds so far. This one exhibited the same symptoms( stretched her legs, paralyzed body). But the other birds were dying differently. This one seems to be gasping fo ait for two days ( probably is not able even to sleep). What sould I do to help her agony? It is really hard for me to kill. should I give her some sedative? Please,help!