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Mycobacterium africanum cases, California
Edward Desmond1, Ameena T Ahmed, William S Probert
1Microbial Diseases Laboratory, California Department of Health Services, Richmond, California 93804, USA. edesmond@dhs.ca.gov
Emerging Infectious Diseases
|June 18, 2004
Summary
Mycobacterium africanum, a cause of tuberculosis, was identified in California. This finding confirms its presence in the United States and highlights potential transmission routes.
Area of Science:
- Microbiology
- Infectious Diseases
- Genomics
Background:
- Tuberculosis (TB) is a significant global health concern caused by Mycobacterium tuberculosis complex (MTBC) strains.
- While Mycobacterium tuberculosis is the most common cause of TB, other MTBC species can also cause disease.
- Surveillance of MTBC species is crucial for understanding disease epidemiology and transmission.
Observation:
- Five MTBC isolates from California underwent comprehensive identification.
- Molecular techniques including spoligotyping and single nucleotide polymorphism (SNP) analysis were employed.
- Phenotypic characterization and analysis of a specific deletion mutation were also performed.
Findings:
- All five isolates were definitively identified as Mycobacterium africanum.
- This molecular and phenotypic confirmation establishes M. africanum as an etiological agent of tuberculosis in the United States.
- Epidemiological data revealed that three of the five patients had a history of residing in Africa.
Implications:
- The presence of M. africanum in the US necessitates updated diagnostic and surveillance strategies.
- Understanding the geographic origins of isolated strains aids in tracing potential transmission pathways.
- This finding underscores the importance of considering diverse MTBC species in TB control efforts, particularly in diverse populations.