Would live in a human host.

It seems I am talking to a human host.

Hidden away in the blood of a human host.

Meaning it would live in a human host.

Hidden away in the blood of a human host.

- A creature that "gestates...inside a living human host".

Raccoon roundworms are not excreted by their human host.

Aye, otherwise, why have a human host at all?

An alien entity capable of taking over human hosts, not unlike the Goa'uld.

Daniel, the human host of a System Lord has been through the sarcophagus countless times.