I remember watching an animated film on Netflix when I was a kid about a spaceship infested by a disease that turns people into zombies. It looked old and was removed from Netflix. It’s probably been around 11 years since I’ve last seen it. I keep on remembering it every now and then because of how it would scare me. It was definitely an adult rated film because of all the gore.
Was it "Dead Space: Downfall" (2008) perhaps?
An alien artifact is discovered in a remote colonized planet. A powerful corporation sends a ship to investigate based on religious beliefs only to find out an outbreak of violent behaviour (I think they call it massacre several times).
The ship gets infected starting a race for survival with very graphic consequences.