F. tularensis F. novicida F. hispaniensis F. persica F. noatunensis F. philomiragia F. halioticida F. endociliophora F. guangzhouensis F. piscicida Francisella is a genus of Gram-negative bacteria.

[3] Ticks do not use any other food source than vertebrate blood and therefore ingest high levels of protein, iron and salt, but few vitamins.

Their experimental elimination typically results in decreased tick survival, molting, fecundity and egg viability, as well as in physical abnormalities, which all are fully restored with an oral supplement of B vitamins.

Francisella has been detected in ticks [8] The taxonomy of the genus is somewhat uncertain, especially in the case of F. novicida (may be a subspecies of F. tularensis).

[7] After 24 hours of incubation on appropriate solid media, Francisella colonies are generally small (1 to 2 mm), opaque, and white-gray to bluish-gray in color.