M haemophilum was first isolated from subcutaneous abscesses in a patient with Hodgkin disease. Most recent infections have occurred in patients with AIDS, in transplant recipients, and in patients receiving tumor necrosis factor-alpha inhibitors. [2, 3, 4] M haemophilum skin infection has been associated with permanent eyebrow makeup and tattoos,  as well as accupuncture treatments. 
M haemophilum is a fastidious (requires special growth media) mycobacterium that requires heme-supplemented culture media and low temperatures for growth. Because of these features, it is probably underdiagnosed.
The pathophysiology, natural habitat, and mechanism for acquisition of M haemophilum infection are not known. Water reservoirs may be the source of M haemophilum infections. Immunocompromised adults with M haemophilum infection most commonly present with skin lesions. Septic arthritis and osteomyelitis may also occur. Pulmonary infection is much less common and may follow skin disease. M haemophilum infection occasionally causes pulmonary infection initially. Mycobacteremia may occur.
More than 40 cases of M haemophilum infection have been reported, including 10 cases in Arizona from 1984-1994. Most cases occurred in immunosuppressed patients. The incidence of disease is unknown.
Cases of M haemophilum infection have been reported sporadically from Australia, France, Germany,  Canada, Israel, United Kingdom, and South Africa.
In healthy children, localized cervical lymphadenopathy is a benign disease that responds well to excision of the involved lymph nodes.
In immunocompromised patients, the outcome of disease is determined by the degree of underlying immunosuppression. Some patients with AIDS respond to therapy, while others respond initially but relapse later. Fatalities have occurred in bone marrow transplant recipients.
M haemophilum infection is more common in males than in females. This may be related to the higher incidence of HIV infection in males.
Lymphadenitis occurs in young children.
Most cases in immunocompromised patients occur in adults.
What would you like to print?