Previous Article | Next Article ![]()
Clinical Microbiology Reviews, 04 1997, 298-319, Vol 10, No. 2
J Alvar, C Canavate, B Gutierrez-Solar, M Jimenez, F Laguna, R Lopez-Velez, R Molina and J Moreno
Over 850 Leishmania-human immunodeficiency virus (HIV) coinfection cases
have been recorded, the majority in Europe, where 7 to 17% of HIV- positive
individuals with fever have amastigotes, suggesting that
Leishmania-infected individuals without symptoms will express symptoms of
leishmaniasis if they become immunosuppressed. However, there are indirect
reasons and statistical data demonstrating that intravenous drug addiction
plays a specific role in Leishmania infantum transmission: an anthroponotic
cycle complementary to the zoonotic one has been suggested. Due to anergy
in patients with coinfection, L. infantum dermotropic zymodemes are
isolated from patient viscera and a higher L. infantum phenotypic
variability is seen. Moreover, insect trypanosomatids that are currently
considered nonpathogenic have been isolated from coinfected patients. HIV
infection and Leishmania infection each induce important analogous
immunological changes whose effects are multiplied if they occur
concomitantly, such as a Th1-to- Th2 response switch; however, the
consequences of the viral infection predominate. In fact, a large
proportion of coinfected patients have no detectable anti-Leishmania
antibodies. The microorganisms share target cells, and it has been
demonstrated in vitro how L. infantum induces the expression of latent
HIV-1. Bone marrow culture is the most useful diagnostic technique, but it
is invasive. Blood smears and culture are good alternatives. PCR,
xenodiagnosis, and circulating-antigen detection are available only in
specialized laboratories. The relationship with low levels of CD4+ cells
conditions the clinical presentation and evolution of disease. Most
patients have visceral leishmaniasis, but asymptomatic, cutaneous,
mucocutaneous, diffuse cutaneous, and post-kala-azar dermal leishmaniasis
can be produced by L. infantum. The digestive and respiratory tracts are
frequently parasitized. The course of coinfection is marked by a high
relapse rate. There is a lack of randomized prospective treatment trials;
therefore, coinfected patients are treated by conventional regimens.
Prophylactic therapy is suggested to be helpful in preventing relapses.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Leishmania and human immunodeficiency virus coinfection: the first 10 years
Laboratorio de Referencia de Leishmaniasis, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»