Humans are not the only known host for bacterium<em> Francisella</em>. For example, <em>Francisella</em> species such as <em>Francisella tularensis</em> uses many other organisms as its host.
Some of the non-human host organisms for <em>Francisella tularensis </em>are wild rabbits, most of the domestic and wild animals. The <em>Francisella tularensis </em>serve as causative agent of tularemia in these organisms which is a plague-like disease.