Which of the following statements concerning Francisella is false? A. An attenuated vaccine is used for high-risk individuals B. It resists phagocytosisC. Humans are its only known hostD. It is extremely infectiousE. It cannot be treated with penicillins or cephalosporins

Humans are its only known host

Explanation:

Humans are not the only known host for bacterium Francisella. For example, Francisella species such as Francisella tularensis uses many other organisms as its host.

Some of the non-human host organisms for Francisella tularensis are wild rabbits, most of the domestic and wild animals. The Francisella tularensis serve as causative agent of tularemia in these organisms which is a plague-like disease.