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This chapter talks about francisella, which are small, aerobic, catalase-positive, pleomorphic, gram-negative intra- and extracellular coccobacilli. It describes four recognized subspecies of F. tularensis: tularensis (Type A), holarctica (Type B), mediasiatica, and novicida. It also analyzes F. tularensis Type A, which has been described as the more virulent of the subspecies and is found predominantly in North America. The chapter looks at F. tularensis Type B that exists throughout the northern hemisphere. It examines Tularemia as a zoonotic infection that can infect a wide variety of invertebrates, such as the dog tick (Dermacentor variabilis) and wood tick (Dermacentor andersoni), and vertebrates, such as rabbits, muskrats, prairie dogs, and other rodents. |
