Leishmania mexicana


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Leishmania

 [lēsh-ma´ne-ah]
a genus of protozoa comprising parasites of worldwide distribution, several species of which are pathogenic for humans. All species are morphologically indistinguishable, and therefore the organisms have usually been assigned to species and subspecies according to their geographic origin, the clinical syndrome they produce, and their ecologic characteristics. They have also been separated based on their tendency to cause visceral, cutaneous, or mucocutaneous leishmaniasis. In some classifications, Leishmania is grouped in four complexes comprising species and subspecies: L. donovani, L. tropica, L. mexicana, and L. viannia.
Life cycle of Leishmania. From Mahon and Manuselis, 2000.
Leishmania brazilien´sis Leishmania viannia.
Leishmania donova´ni donova´ni a subspecies of the L. donovani complex causing the classic form of visceral leishmaniasis in India. It is transmitted by the sandfly Phlebotomus argentipes, with humans being the only major reservoir hosts. Called also L. donovani.
Leishmania ma´jor a species of the L. tropica complex, transmitted by Phlebotomus papatasi, causing the rural form of Old World cutaneous leishmaniasis. Called also L. tropica major.
Leishmania mexica´na a complex comprising the species and subspecies causing the New World form of cutaneous leishmaniasis in humans: L. m. mexicana, L. m. amazonensis, and L. pifanoi.
Leishmania tro´pica
1. a complex comprising the species causing the Old World form of cutaneous leishmaniasis: L. tropica, L. major, and L. aethiopica.
2. a species of the L. tropica complex causing the urban form of Old World cutaneous leishmaniasis. It is found in Iran, Iraq, and India, transmitted by Phlebotomus sergenti; and in southern France, Italy and certain Mediterranean islands, transmitted by P. papatasi. Human to human transmission may also occur.
Leishmania vian´nia a taxonomic complex comprising the subspecies that cause mucocutaneous leishmaniasis in its various forms; all of the subspecies develop in the midgut, foregut, and hindgut of their sandfly vectors. Formerly called L. braziliensis.

Leish·man·i·a mex·i·ca'n·a

the agent of many forms of cutaneous leishmaniasis, now considered a complex of several subspecies or possibly species, each with distinctive DNA and enzyme characteristics, distribution, and vector-reservoir host association, resulting in distinct manifestations of human leishmaniasis; reservoir hosts are extremely diverse and include a wide array of arboreal rodents as well as marsupials, primates, and small carnivores. Typical disease forms caused by this species are chiclero ulcer and diffuse cutaneous leishmaniasis, in contrast with mucocutaneous leishmaniasis, more characteristic of Leishmania braziliensis infection.
References in periodicals archive ?
Leishmania mexicana and Leishmania major: attenuation of wild-type parasites and vaccination with the attenuated lines.
Sarah Kerr, Chad McHugh, Robert Merkelz, Short Report: A Focus of Leishmania mexicana Near Tucson, Arizona, 1999
La actividad del ajoeno ha sido probada en diversos microorganismos, tal es el caso de: Paracoccidioides brasiliensis (13), Trypanosoma cruzi (27), Microsporum canis (25), Leishmania mexicana (12) y Cladophialophora carrionii (28) ha mostrado altos valores de CMI y en M.
Axenic cultivation and characterization of Leishmania mexicana amastigotes-like forms.
Experimental transmission of Leishmania mexicana to hamsters by bites of phlebotomine sand flies (Diptera: Psychodidae) from the United States.
A su regreso a Mexico, el investigador dio a conocer la existencia de la Leishmania mexicana pero no causo gran impresion en el pais; sin embargo, el nombre de Biagi --quien aun no cumplia 25 anos de edad-- fue citado en numerosos libros extranjeros.
Effect of the anti-microtubule drug oryzalin on growth and differentiation of the parasitic protozoan Leishmania mexicana.
El control positivo para Leishmania provino de un raton infectado con Leishmania mexicana, y el control positivo de Wolbachia se obtuvo de Culex quinquefasciatus el cual es conocido por ser portador de Wolbachia (Glaser & Meola 2010).
There are no vaccines at this time but there has been some study on a vaccine to Leishmania mexicana.
1997) Identification of a transcription factor like protein at the TOR locus in Leishmania mexicana amazonensis.