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I checked with our vet about that, as we were freely giving kitchen leftover snacks to the chickens then the salmonella outbreak happened; he sent stool specimens to his lab for Ova&Parasite, culture and fungal smear, the tests resulted all fine. It cost me $31 to have the chickens' poop tested.
I could only stop worrying after my vet said they were OK. If you're as much a worry-wart as I am, I'd recommend the peace of mind that lab report ensures!
Bloody diarrhea is often a sign of bowel infection. But in chickens, who are pretty much giving birth daily, blood from the vent can just be from "skid marks". One of our littlest hens even had a prolapsed vent; fixed with old fashioned preparation H and occasional plain gel lubricant. Maybe pick up and inspect your hens' vents? See if one could use a little help?