The species has not been identified in any other host organisms.

The most important of all, they do not elicit immune responses in the host organism.

Nick has made his life's quest the hunting down and killing of the host organism, who is 900 years old.

The host organism derives some or all of its energy requirements from the algae.

But often the host organism does not have much free iron around.

In fact, such changes often don't last past the initial host organism.

These bacteria are parasites that cannot survive outside their host organism.

In host organisms with opaque bodies, such an ability would most likely rapidly be lost.

Some of these cyanobionts cannot live without the host organism.

The media virus is any idea that infiltrates the host organism of modern society.