I have a banty hen, just a bit bigger than an oegb hen, who takes spells of sneeze then stretch her neck out. She'll sit on the ground and breath heavy for a bit then sneeze and stretch. Wierd. I wondered about gape worm but all were wormed with Eprinex just a few weeks ago. No one else is showing symptoms. Funny thing is she seems to eat and drink just fine. She'll be ok for a day or so then start again. However, her comb and waddles are beginning to lose color.