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      Phlebotomine Sand Flies (Diptera: Psychodidae) in Iran and their Role on Leishmania Transmission

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          Abstract

          Sand fly research has a long history in Iran beginning with the work of Adler, Theodor and Lourie in 1930 and followed by Mesghali’s foundational taxonomic work on sand flies in 1943. Since then, research has been continued unabated throughout the country and official publications report the existence of at least 44 species of sand flies (26 of the genus Phlebotomus and 18 of genus Sergentomyia) in Iran. So far, seven Phlebotomus species and one Sergentomyia species have been collected and described by Iranian researchers for the first time. Natural promastigote infections have been repeatedly found in 13 species of sand flies and modern molecular techniques are used routinely to characterize Leishmania parasite isolates from endemic areas of cutaneous and visceral leishmaniasis. Because of anthropogenic environmental modifications or human population movements, data on phlebotomine sand flies should be regularly updated and verified at least every five years by fieldwork and taxonomy in foci of leishmaniasis, to incriminate vector species of relevance to the ecology of transmission and to support development and implementation of control programs.

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          Nested PCRs and sequencing of nuclear ITS-rDNA fragments detect three Leishmania species of gerbils in sandflies from Iranian foci of zoonotic cutaneous leishmaniasis.

          To identify and understand the natural transmission cycles of Leishmania in Iranian sandflies. Nested PCR protocols were developed to amplify two regions of the ribosomal RNA amplicon of Leishmania (ITS1-5.8S rRNA gene, and a microsatellite DNA region of ITS2), which were species-specific by DNA sequence or fragment size. The PCR assays detected in Iranian sandflies not only Leishmania major but also for the first time L. turanica and L. gerbilli sensu lato, two other parasites of the great gerbil. All three parasites were found in the northeast and centre of Iran, in two foci of rural Zoonotic Cutaneous Leishmaniasis (ZCL) caused by L. major. Fifty infections were detected in common sandfly species: at least six geographically differentiated haplotypes of L. major in four to five sandfly species; one strain of L. gerbilli s.l. in five to six sandfly species and one strain of L. turanica in one sandfly species. Past conclusions about the transmission cycles of L. major in Iran should be treated with caution. Careful molecular eco-epidemiological investigations are essential for modelling the roles of different sandfly species in maintaining and spreading ZCL foci. Even if non-pathogenic to humans, frequent inoculations of L. turanica by sandflies might alter the efficacy of vaccines against L. major. Phlebotomus papatasi is probably the key vector in many ZCL foci because of its abundance and high infection rates with both L. major and L. turanica.
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            ON THE PHLEBOTOMINAE OF IRAN.

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              Meriones libycus and Rhombomys opimus (Rodentia: Gerbillidae) are the main reservoir hosts in a new focus of zoonotic cutaneous leishmaniasis in Iran.

              Following an epidemic of zoonotic cutaneous leishmaniasis (ZCL) around Badrood city, central Iran, Meriones libycus were found to be naturally infected with Leishmania major zymodeme MON-26 (= LON-1) in the villages of Matinabad and Fami, 12 km north-west of Badrood. This is the first isolation and characterization of L. major from M. libycus in Iran, in an area where ZCL has been present recently. M. libycus is probably the principal reservoir host in this area, but the main reservoir host further east is Rhombomys opimus. Parasites were not found in Hemiechinus auritis. The main, proven vector to humans and gerbils is Phlebotomus (Phlebotomus) papatasi. The close contact between vectors and reservoirs creates a very efficient cycle for the transmission of the disease.
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                Author and article information

                Journal
                J Arthropod Borne Dis
                J Arthropod Borne Dis
                IJAD
                Journal of Arthropod-Borne Diseases
                Tehran University of Medical Sciences
                2322-1984
                2322-2271
                2012
                30 June 2012
                : 6
                : 1
                : 1-17
                Affiliations
                Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
                Author notes
                Corresponding author: Prof Mohammad Reza Yaghoobi- Ershadi, E-mail: yaghoobi.reza@ 123456gmail.com
                Article
                ijad-6-1
                3528173
                23293774
                50ef01dc-f2e1-4455-a9f2-d066d1d7b705
                Copyright © Iranian Society of Medical Entomology & Tehran University of Medical Sciences

                This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial 3.0 License (CC BY-NC 3.0), which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.

                History
                : 20 May 2012
                : 11 June 2012
                Categories
                Review Article

                Infectious disease & Microbiology
                leishmania infantum,leishmaniasis,vectors,iran,leishmania major,leishmania tropica,taxonomy,sand flies

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