Chicken dying

[Rickycyr]

Okay where was the blood coming from? Any feather loss? Any big gashes on the body? Can you examine them?

No gashes noting

 

[Stayc]

No gashes noting

So just blood coming out of their backside?

 

[Rickycyr]

So just blood coming out of their backside?

Yes

 

[Stayc]

Yes

Its hard to say. I'm nowhere near an expert. I would definitely worm the other ones
https://www.backyardchickens.com/threads/bloody-vent-dying-chickens.857365/