Hi, I've got some young chics / pullets that are dying about 1 every other day. The syptoms are I will see a chicken being REALLY lethargic and it is only somewhat responsive if I touch it. It has its eyes shut and with in the next 1/2 day to day it's dead. I'm wondering if this is some kind of parasite or bacterial infection? Any help would greatly be appreciated. The chickens dying are between 2 to 4mo old. The mature chickens seem to be fine. I've had this problem before with another batch of chickens(different kind of chicken and from different local person I bought from). HELP ! Thank you.