Background

Researchers first described Mycobacterium xenopi in 1959 after isolating it from skin lesions of the South African toad Xenopus laevis.M xenopi, a slow-growing, nontuberculous mycobacterium, is often considered to be a saprophyte or an environmental contaminant. It grows optimally at 45°C (113°F) and has been found, occasionally in large numbers, in hospital hot water supplies at the outlet valves of water heaters.^{[1, 2]}M xenopi colonization occurs from ingestion or inhalation of, or cutaneous exposure to, organisms in water, soil, or airborne particles. Colonization of hospital water systems is associated with infection, disease, and nosocomial isolation.

Pathophysiology

M xenopi has low pathogenicity, and host impairment is required to contract disease from the organism. Most M xenopi infections occur in the lungs, usually in patients with preexisting lung disease or with predisposing conditions (eg, extrapulmonary malignancy, alcoholism, diabetes mellitus, HIV infection). Extrapulmonary and disseminated disease may develop in patients with AIDS or other immunodeficiencies.

For pulmonary disease, inhalation of infected airborne particles is the usual route of infection. For skin and soft tissue infections, direct contact through penetrating injuries and surgical procedures provide the route. Person-to-person transmission of nontuberculous mycobacterial disease has never been documented.

Frequency

United States

Surveillance data for M xenopi infection are not available because such infection is not a reportable disease. More than 500 cases have been reported, but only approximately 70 cases seem to document true disease.

International

Prevalence is unknown.

Mortality/Morbidity

Subjects with documented M xenopi infections are divided into the following broad categories:

The first group comprises young, severely immunocompromised individuals in whom M xenopi infection occurs as an opportunistic infection that may then become disseminated, conferring a high risk of mortality and morbidity. Persons with CD4+ cell counts of less than 50/µL are susceptible hosts for pathogens such as M xenopi. M xenopi can cause 2 patterns of disease in these patients: localized pulmonary disease that can mimic tuberculosis in persons with early-stage HIV infection and disseminated disease in those with advanced AIDS.
The second group comprises immunocompetent adults with chronic lung disease or chronic obstructive pulmonary disease (COPD) in whom M xenopi infection usually follows a long-term, indolent course.

Race

No racial predilection has been identified.

Sex

No predilection for either sex has been demonstrated.

Age

No age predilection has been reported.

Prognosis

Outcome is favorable. Many people are colonized but asymptomatic.

Patient Education

See the list below:

Adverse effects of medications
Patient compliance with medical therapy (risk of acquired resistance if compliance is < 80%)

Clinical Presentation

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Author

Mansoor Arif, MD Hospitalist, Department of Medicine, Mount Auburn Hospital; Instructor, Department of Medicine, Harvard Medical School

Mansoor Arif, MD is a member of the following medical societies: American College of Physicians, Massachusetts Medical Society

Disclosure: Nothing to disclose.

Coauthor(s)

Syed Faisal Mahmood, MBBS Associate Professor of Infectious Diseases, Program Director, Infectious Diseases Fellowship Program, Department of Medicine, Aga Khan University Hospital, Pakistan

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Aaron E Glatt, MD, MACP, FIDSA, FSHEA Chairman, Department of Medicine, Chief, Division of Infectious Diseases, Hospital Epidemiologist, Mount Sinai South Nassau; Professor of Medicine, Icahn School of Medicine at Mount Sinai

Aaron E Glatt, MD, MACP, FIDSA, FSHEA is a member of the following medical societies: American Association for Physician Leadership, American College of Chest Physicians, American College of Physicians, American College of Physicians-American Society of Internal Medicine, American Medical Association, American Society for Microbiology, American Thoracic Society, American Venereal Disease Association, Infectious Diseases Society of America, International AIDS Society, Society for Healthcare Epidemiology of America

Disclosure: Nothing to disclose.

Chief Editor

Michael Stuart Bronze, MD David Ross Boyd Professor and Chairman, Department of Medicine, Stewart G Wolf Endowed Chair in Internal Medicine, Department of Medicine, University of Oklahoma Health Science Center; Master of the American College of Physicians; Fellow, Infectious Diseases Society of America; Fellow of the Royal College of Physicians, London

Michael Stuart Bronze, MD is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, American Medical Association, Association of Professors of Medicine, Infectious Diseases Society of America, Oklahoma State Medical Association, Southern Society for Clinical Investigation

Disclosure: Nothing to disclose.

Acknowledgements

Martin Backer, MD Fellow in Combined Adult and Pediatric Infectious Diseases, State University of New York Health Sciences Center