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Phlebotomine sand flies (Diptera: Psychodidae) in the municipality of Várzea Grande: an area of transmission of visceral leishmaniasis in the state of Mato Grosso, Brazil
Missawa, Nanci Akemi;Dias, Edelberto Santos;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007000800004
Abstract: visceral leishmaniasis (vl) has been naturally transmitted in periurban areas due to the emergence and reemergence of its vectors in such areas. aimed to further knowledge on ecological aspects affecting the occurrence of phlebotomine sand flies in vl transmission areas in the municipality of várzea grande, state of mato grosso (mt), brazil, sand fly captures were carried out. monthly collections of sand flies were undertaken with cdc light-traps, which were left in both intradomiciliary and peridomiciliary areas of ten residences during four consecutive days between january 2004 and june 2006. twenty-two species of genus lutzomyia and one of brumptomyia were captured. the most abundant species was lutzomyia longipalpis (65.23%), followed by l. evandroi (16.26%), l. lenti (7.69%), l. whitmani (4.92%), l. sallesi (2.34%) and l. termitophila (1.32%). the highest density of the main vl vector, l. longipalpis, was found in peridomiciliary areas, mostly males. no significant correlation was found between environment (temperature, air relative humidity and rain fall) and phlebotomine density; although a slight increase in sand fly density has been observed in the period following rainfalls, particularly l. longipalpis. no correlation was observed between distribution and density of l. longipalpis, prevalence of human vl cases and the presence of serologically positive dogs. the presence of infected dogs, increased vector density, susceptibility rate and interruption of epidemiological surveillance may raise the risk of vl transmission to man in várzea grande.
Leishmaniose visceral no município de Várzea Grande, Estado de Mato Grosso, no período de 1998 a 2007
Missawa, Nanci Akemi;Borba, Jo?o Francisco;
Revista da Sociedade Brasileira de Medicina Tropical , 2009, DOI: 10.1590/S0037-86822009000500005
Abstract: this study aimed to describe the epidemiology and spread of visceral leishmaniasis in the municipality of várzea grande, state of mato grosso, brazil, between 1998 and 2007. forty-eight human cases were reported, with an incidence rate of up to 11.7 per 100,000 inhabitants, particularly among children and adolescents of both sexes, with marked geographical spread of the disease in the municipality.
Distribui??o espacial de Lutzomyia longipalpis (Lutz & Neiva, 1912) e Lutzomyia cruzi (Mangabeira, 1938) no estado de Mato Grosso
Missawa, Nanci Akemi;Lima, Giovana Belem Moreira;
Revista da Sociedade Brasileira de Medicina Tropical , 2006, DOI: 10.1590/S0037-86822006000400004
Abstract: visceral leishmaniasis is currently considered an emergent and reemergent disease, in agricultural and urban zones, both in domestic and peridomestic areas. the objective of this work was to verify the spatial distribution of lutzomyia longipalpis and lutzomyia cruzi in mato grosso state. data from 1996 to 2004 was collected by the entomology laboratory, whose captures were carried with a cdc light trap. sixty-eight of the 139 cities in the state have been studied. lutzomyia longipalpis and lutzomyia cruzi occurred in 23 and 22 cities, respectively. the results demonstrate the extensive occurrence of lutzomyia longipalpis in areas with different vegetation types: savanna, transition and amazon forest. lutzomyia cruzi occurred mainly in cities with areas of marshland and savanna. verification of the distribution of the vector populations in the state and their preferential vegetation type, provides an indication of vulnerable and/or receptive areas for disease transmission.
Fauna flebotomínica (Diptera: Psychodidae) em aldeias indígenas do Estado de Mato Grosso
Maciel, Giovana Belem Moreira Lima;Missawa, Nanci Akemi;
Revista da Sociedade Brasileira de Medicina Tropical , 2009, DOI: 10.1590/S0037-86822009000500023
Abstract: this study was conducted in 25 indigenous villages in 13 municipalities of the state of mato grosso. 4,424 specimens of 37 species of the genus lutzomyia and one species of the genus brumptomyia were identified. vectors for american tegumentary leishmaniasis and visceral leishmaniasis were abundantly captured, and these represented 28.7% (lutzomyia whitmani) and 23.6% (lutzomyia longipalpis), respectively.
Preferência alimentar de Lutzomyia longipalpis (Lutz & Neiva, 1912) em área de transmiss?o de leishmaniose visceral em Mato Grosso
Missawa, Nanci Akemi;Lorosa, Elias Seixas;Dias, Edelberto Santos;
Revista da Sociedade Brasileira de Medicina Tropical , 2008, DOI: 10.1590/S0037-86822008000400008
Abstract: studies on the feeding habits and intestinal content of sandflies make it possible to identify hosts, thereby indicating potential reservoirs for leishmania. the present study had the aim of determining the feeding preferences of lutzomyia longipalpis and its relationship with the transmission of visceral leishmaniasis. specimens were caught every month in a transmission area of visceral leishmaniasis, in the municipality of várzea grande, state of mato grosso, from january 2004 to june 2006, using cdc light traps. 2,376 females of lutzomyia longipalpis were caught, of which 104 (4.4%) were engorged. among these, 32 (30.8%) were caught inside homes and 72 (69.2%) in areas surrounding homes. from the precipitin reaction, it was observed that lutzomyia longipalpis females fed preferentially on birds (30.8%) and rodents (21.2%), but they were also found to have fed on blood from humans, opossums, oxen, horses and dogs, thus demonstrating the opportunist nature of this species.
List of species in the genus Lutzomyia, Fran?a, 1924 (Psychodidae, Phlebotominae) from the State of Mato Grosso
Missawa, Nanci Akemi;Maciel, Giovana Belem Moreira Lima;
Revista da Sociedade Brasileira de Medicina Tropical , 2007, DOI: 10.1590/S0037-86822007000100002
Abstract: this work had the objective of listing the sand fly species that occur in the state of mato grosso, brazil. data relating to entomological surveys conducted between 1996 and 2004 were obtained from the national health foundation and the state health department, and this was supplemented with information from research carried out in the state and from the specialized literature. there were records of 106 sand fly species belonging to the genus lutzomyia. this is a rich and diversified fauna, with some species restricted to forested areas and others recorded throughout the state, independent of the vegetation type, and in areas modified by human action, with predominance of lutzomyia whitmani.
Distribution of phlebotomine sandflies (Diptera: Psychodidae) of medical importance in Mato Grosso State, Brazil
Ribeiro, Ana Lúcia Maria;Missawa, Nanci Akemi;Zeilhofer, Peter;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2007, DOI: 10.1590/S0036-46652007000500008
Abstract: intense environmental impacts, causing alterations of the natural habitats of fauna, including those of sandfly disease vectors are observed in mato grosso state, central brazil. entomologic survey of phlebotomines was based on light trap and was carried out by entomological nucleus of the funasa and ses in the period between 1996 and 2001. eighty eight species were identified, including the following sandflies with medical importance to leishmaniasis: lutzomyia amazonensis, l. anduzei, l. antunesi, l. ayrozai, l. carrerai carrerai, l. complexa, l. cruzi, l. flaviscutellata, l. intermedia, l. longipalpis, l. migonei, l. paraensis, l. ubiquitalis, l. whitmani and l. yuilli yuilli. most sandflies of medical importance occurred in the amazon forest and savannah. l. longipalpis and l. cruzi had high densities in the savannah region. l. flaviscutellata is predominating in both the amazon forest and the savannah region. l. whitmani and l. antunesi were sampled in the amazon forest, savannah and marsh land.
Lutzomyia longipalpis naturally infected by Leishmania (L.) chagasi in Várzea Grande, Mato Grosso State, Brazil, an area of intense transmission of visceral leishmaniasis
Missawa, Nanci A.;Michalsky, érika Monteiro;Fortes-Dias, Consuelo Latorre;Santos Dias, Edelberto;
Cadernos de Saúde Pública , 2010, DOI: 10.1590/S0102-311X2010001200020
Abstract: the american visceral leishmaniasis (avl) is caused by parasites belonging to the genus leishmania (trypanosomatidae) and is transmitted to humans through the bite of certain species of infected phlebotomine sand flies. in this study, we investigated the natural infection ratio of lutzomyia longipalpis, the main vector species of avl in brazil, in várzea grande, mato grosso state. between july 2004 and june 2006, phlebotomine sand flies were captured in peridomestic areas using cdc light-traps. four hundred and twenty (420) specimens of lu. longipalpis were captured. 42 pools, containing 10 specimens of lu. longipalpis each, were used for genomic dna extraction and pcr (polymerase chain reaction) amplification. leishmania spp. dna was detected in three out of the 42 pools tested, resulting in a minimal infection ratio of 0.71%. restriction fragment length polymorphism (rflp) analysis indicated that leishmania (l.) chagasi was the infective agent in the positive pools.
Comparison of capture methods for the diagnosis of adult anopheline populations from State of Mato Grosso, Brazil
Missawa, Nanci Akemi;Ribeiro, Ana Lúcia Maria;Maciel, Giovana Belem Moreira Lima;Zeilhofer, Peter;
Revista da Sociedade Brasileira de Medicina Tropical , 2011, DOI: 10.1590/S0037-86822011005000053
Abstract: introduction: the present study compares human landing catches of primary malaria vectors with two alternative methods of capture: the shannon trap and the mosquito magnet. methods: this study used regression models to adjust capture data to a negative binominal distribution. results: capture numbers and relative percentages obtained from the three methods vary strongly between species. the highest overall captures were obtained for anopheles triannulatus with captures for the shannon trap and the mosquito magnet measuring more than 330% higher than captures obtained by human landings. for anopheles darlingi, captures by the shannon trap and the mosquito magnet were about 14% and 26% of human landing catches, respectively. another species with malaria transmission potential that was not sampled by human landing captures weascaptured by the shannon trap and the mosquito magnet (anopheles oswaldoi). both alternative sampling techniques can predict the human landing of anopheles triannulatus, but without proportionality. models for anopheles darlingi counts, after totaling daily captures, are significant and proportional, but prediction models are more reliable when using the shannon trap compared with the mosquito magnet captures. conclusions: these alternative capture methods can be partially recommended for the substitution of human landing captures or, at least, as complementary forms of monitoring for malarial mosquitoes.
Distribui??o geográfica de Lutzomyia (Nyssomyia) whitmani (Antunes & Coutinho, 1939) no Estado de Mato Grosso
Missawa, Nanci Akemi;Maciel, Giovana Belém Moreira Lima;Rodrigues, Hilda;
Revista da Sociedade Brasileira de Medicina Tropical , 2008, DOI: 10.1590/S0037-86822008000400009
Abstract: in the state of mato grosso, 100% of the municipalities have records of autochthonous cases of american cutaneous leishmaniasis. the present study had the aim of investigating the geographical distribution of the lutzomyia whitmani in the state. mato grosso has three distinct ecosystems: the savannah, the marshland and the area of the amazon domain. data on occurrences of lutzomyia whitmani were obtained from reports on entomological surveys carried out by the entomology group of the national health foundation between 1996 and 2000 and by the entomology laboratory of the mato grosso state health department between 2001 and 2006. entomological surveys were performed in 83 (59.7%) of the 139 municipalities of mato grosso. lutzomyia whitmani was caught in 70 (84.3%) municipalities, with widespread distribution in all types of vegetation.
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