Three subspecies (biovars) of<unk>  are recognised (as of 2020): # F. t.<unk>  (or type A), found predominantly in North America, is the most virulent of the four known subspecies, and is associated with lethal pulmonary infections. This includes the primary type A laboratory strain, SCHUS4. # F. t. holarctica (also known as biovar F. t. palearctica or type B) is found predominantly in Europe and Asia, but rarely leads to fatal disease. An attenuated live vaccine strain of subspecies F. t. holarctica has been described, though it is not yet fully licensed by the Food and Drug Administration as a vaccine. This subspecies lacks the citrulline ureidase activity and ability to produce acid from glucose of biovar F. t. palearctica. #F. t. mediasiatica, is found primarily in central Asia; little is currently known about this subspecies or its ability to infect humans. Additionally, F. novicida has sometimes previously been classified as F. t. novicida. It was characterized as a relatively nonvirulent<unk> ; only two tularemia cases in North America have been attributed to the organism, and these were only in severely immunocompromised individuals.
Francisella tularensis
Yersinia pestis
Kingella kingae
Bacillus anthracis
Edwardsiella 
Salmonella enterica subsp. enterica
Listeria monocytogenes
Vibrio vulnificus