Francisella tularensis

… caused by the gram-negative bacterium Francisella tularensis known for its different clinical forms, which are characterized by varying signs and symptoms that range from mild to severe. F. tularensis is extremely infectious, with as few as 10 organisms capable of causing disease in humans; the organism also has different subspecies,…

…is caused by the bacterium Francisella tularensis. Several species and genera of ticks are vectors for the disease, and may be largely responsible for perpetuating it wild animal populations. In addition, the bacterium is transmitted from the adult tick to the egg, and both larvae and nymphs are infectious and…