Bacillary angiomatosis (BA) is a systemic infection caused by Bartonella species, occurring nearly exclusively in HIV-infected individuals, characterized by cutaneous vascular tumors resembling Kaposi's sarcoma and symptomatic multisystemic infection, most commonly involving the liver (peliosis hepatis) and/or spleen (parenchymal bacillary peliosis).
Bartonella spp. cause vascular proliferation (angiogenesis): B.bacilliformis, verruga peruana; B.henselae and B.quintana, BA.
Additional risk factors for bacillary angiomatosis associated with B quintana infection include the following:
* Low socioeconomic status
* Exposure to body and hair lice
* HIV infection
* Chronic lymphocytic leukemia
* Cytotoxic chemotherapy
* Organ transplantations
* high fever
* tender and swollen lymph nodes
* poor appetite
* Weight loss
* Gastrointestinal symptoms