Help! Rooster is shaking his body/feathers/legs

[Glory Bee]

I'm not sure what to do! My favorite and only Barred Rock rooster is periodically shaking his whole body and legs. His eyes, comb,respiration seem fine. Does anyone have ideas as to what I can do for him?I read it could be botulism or erysipelas??? I have some VetRx I have not used. His living conditions have been stable as far as I can see.No other body changes I see.

 

[Glory Bee]

Also he is 7 months old. I did find a dead sparrow with its head eaten off in the yard a week ago.All 23 other chickens seem fine.18 degrees here.I spray coop with Oxine once a week.Clean coop.

 

[ChickensAreSweet]

http://www.thepoultrysite.com/diseaseinfo/9/avian-encephalomyelitis-epidemic-tremors
I am showing you this link, since there are some other conditions mentioned at the bottom of the link...it says to differentiate from those conditions.

So tremors could be from various problems. Could he be simply shivering from cold?

 

[Glory Bee]

Thank you "Chickens Are Sweet' for responding!! I don't think he is cold but I am isolating him in a warmer room. I hope he will make it.I read it could be Mareks or dry Pox as well.