melitensis is the most frequently reported cause of brucellosis worldwide, but the most widespread potential source of infection is B. This number is likely an underestimate, however, because cases are underreported and often misdiagnosed because clinical symptoms are nonspecific, physicians might lack awareness, and laboratory capacity for diagnosis is limited. Over 500,000 new human cases of brucellosis-a bacterial zoonosis-are reported worldwide each year. known to cause human disease are Brucella abortus (including the livestock vaccine strain Brucella abortus RB51), B. A clinical laboratory certified in high complexity testing state health department CDC’s Bacterial Special Pathogens Branch or the CDC Emergency Operations Center (77) Infectious Agentīrucella spp., the causative agents for brucellosis, are facultative, intracellular, gram-negative coccobacilli.
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