I have been gone for 4 weeks and a friend has been feeding and watering my chickens. While I was gone I was told one of my pullets had died. My friend that was watching my chickens buried her before I had a chance to see the corpse. I was wondering if the cause of death could be from worms? I noticed before I left that some of my chickens had foamy poop and now it is a lot worse. Does it look like worms or coccidiosis?