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→Characteristics
*Small, non-moltile, Gram negative coccobacilli
*Small, non-moltile, Gram negative coccobacilli
*Facultatice intracellular pathogens
*Facultative intracellular pathogens
*Modified Ziehl-Neelsen positive - clusters of red coccobacilli on smears
*Modified Ziehl-Neelsen positive - clusters of red coccobacilli on smears
*Aerobic and capnophilic
*Aerobic and capnophilic
*''B. abortus'' lysed by specific bacterophages
*''B. abortus'' lysed by specific bacterophages
*Oxidative metaboloic rates can differentiate species
*Oxidative metaboloic rates can differentiate species
===Pathogenesis and pathogenicity===
===Pathogenesis and pathogenicity===