Biochemical Test of Francisella tularensis subsp. tularensis

Biochemical Test of Francisella tularensis

Image Source: New York State Health Department

Some of the characteristics are as follows:

Basic CharacteristicsProperties (Francisella tularensis subsp. tularensis)
CapsulePositive (+ve)
CatalasePositive (+ve)
FlagellaNegative (-ve)
GasNegative (-ve)
Gelatin HydrolysisNegative (-ve)
Gram StainingFaintly stained Gram-negative
H2S (in cysteine-supplemented medium)Positive (+ve)
IndoleNegative (-ve)
MotilityNegative (-ve)
Nitrate ReductionNegative (-ve)
NH3 produced in liquid mediaNegative (-ve)
ShapeShort, rod-shaped or coccoid
SporeNegative (-ve)
Sodium ricinoleate solubilityPositive (+ve)
UreaseNegative (-ve)
Fermentation of
GlucosePositive (+ve)
GlycerolPositive (+ve)
LactoseNegative (-ve)
MaltosePositive (+ve)
SucroseNegative (-ve)
Enzymatic Reactions
Beta-LactamasePositive (+ve)
Citrulline ureidase (CTU)Positive (+ve)


  1. Bergey’s Manual of Systematic Bacteriology Volume 2: The Proteobacteria, Part B: The Gammaproteobacteria.

About Author

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Sagar Aryal

Sagar Aryal is a microbiologist and a scientific blogger. He attended St. Xavier’s College, Maitighar, Kathmandu, Nepal, to complete his Master of Science in Microbiology. He worked as a Lecturer at St. Xavier’s College, Maitighar, Kathmandu, Nepal, from Feb 2015 to June 2019. After teaching microbiology for more than four years, he joined the Central Department of Microbiology, Tribhuvan University, to pursue his Ph.D. in collaboration with Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Saarbrucken, Germany. He is interested in research on actinobacteria, myxobacteria, and natural products. He has published more than 15 research articles and book chapters in international journals and well-renowned publishers.

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