I think you are referring to a bacteria or virus.
An organism that eats another organism is called a consumer.
Disease-causing agents like viruses, bacteria, and worms are called pathogens. They can invade the body and cause illnesses by disrupting normal bodily functions and triggering immune responses.
An organism that kills and eats all or part of another organism is called a carnivore.
A single organism in an environment is called an individual
this organism is called a carivore...
An ecosystem.
Any organism that eats another organism is called a consumer.
These are called predators.
An organism that kills to eat is called a predator.
The genes an organism contains is called the organism's genotype.
When one organism benefits and the other organism is unaffected it is called commensalism.
it is actually called an organism.