This would make them a candidate for the pathogen's natural host.

Nevertheless in its natural host the cattle leukemia is rare.

But that doesn't make him a natural host.

Since then many other plants have been identified as natural hosts of the pathogen.

Microbes may change form when transmitted from a natural host into a new species.

A virus does not generally kill its natural host.

Humans are the only known natural host for these two viruses.

"The aura does not survive the death of its natural host," the computer said.

He was, in his natural host, healthy and handsome - but again not to any really noteworthy extent.

"Well, we shall soon be recalled to our natural hosts."