5 month old Wyandotte acting sick

[TonyBYC]

Our 5 month old Wyandotte has been acting strange for two days, hiding in dark places, shaking its head and just standing in one place for a long time. And a rooster just died of unknown cause two days ago (we were away so didn’t see symptom progression for him). Any idea what this could be and how we can protect the remaining flock?

See the video here:

 

[Eggcessive]

Do she always have her neck down? Could she have been injured? She might have wry neck symptoms or be drowsy and falling asleep. Can you observe her for awhile? Was she vaccinated for Mareks disease? Can you get her drinking some fluids and eating?

 

[TonyBYC]

No, this just started yesterday, she was happily roaming with the rest until then and no neck issues.
We bought this one at Tractor Supply, they said they do the marek vaccination. Same for the dead rooster
I'll try to observe how she eats/drinks

 

[TonyBYC]

Does not seem to be interested in food or water