Papers by Felipe Arley Costa Pessoa
Parasites & Vectors, 2015
Background: Phlebotomine sand flies (Diptera: Psychodidae) are insects of medical importance due ... more Background: Phlebotomine sand flies (Diptera: Psychodidae) are insects of medical importance due to the role that some species play in the transmission of leishmaniasis. This work aimed to study some ecological aspects among sand flies fauna inhabiting two different environments: the várzea (lowland Amazonian forest) and terra firme (upland Amazonian forest), both located in Tefé Municipality, Amazonas State, Braziland to detect Leishmania infection in those phlebotomine populations. Methods: Sand flies were collected using HP light traps. Collection took place over the course of six months: January, February, April, August, September, and October of 2013. To detect natural infection by Leishmania, DNA samples were extracted from female sand flies and submitted to Polymerase Chain Reaction (PCR) targeting the kDNA gene; Leishmania species were identified by PCR-RFLP targeting the hsp70 gene and genetic sequencing.
Acta Tropica, 2014
Sand flies (Diptera: Psychodidae) are responsible for the transmission of protozoan parasites tha... more Sand flies (Diptera: Psychodidae) are responsible for the transmission of protozoan parasites that cause leishmaniases. They are found predominantly in forests, but some species exploit environments that have been subject to deforestation and subsequent human colonization. Studies conducted in Brazil over the past 30 years show that some species are adapting to peri-urban and urban settings. We evaluated sand fly diversity and abundance in the rural settlement of Rio Pardo, Presidente Figueiredo Municipality, Amazonas State, Brazil. Settlement households were divided into four categories. These categories were determined by the human population density and the degree of deforestation in the immediate area. We used CDC light traps to sample the area surrounding 24 households (6 households in each category). Samples were taken on six occasions during A total of 3074 sand fly specimens were collected, including 1163 females and 1911 males. These were classified into 13 genera and 52 species. The greatest abundance of sand flies and the greatest richness of species were observed in areas where human population density was highest. Our results show that changes in the human occupancy and vegetation management in rural settlements may affect the population dynamics and distribution of sand fly species, thereby affecting the local transmission of cutaneous leishmaniases.
Revista da Sociedade Brasileira de Medicina Tropical, 2013
Memórias do Instituto Oswaldo Cruz, 2010
Memórias do Instituto Oswaldo Cruz, 2001
In the present study, some morphological structures of antennae, maxillary palps and caudal setae... more In the present study, some morphological structures of antennae, maxillary palps and caudal setae of fourth instar larvae of laboratory-reared phlebotomine sand flies (Lutzomyia longipalpis, L. migonei, L. evandroi, L. lenti, L. sericea, L. whitmani and L. intermedia) of the State of Ceará, Brazil, were examined under scanning electron microscopy. The antennal structures exhibited considerable variation in the morphology and position. A prominent digitiform distal segment has been observed only on the antenna of species of the subgenus Nyssomyia. The taxonomic relevance of this and other antennal structure is discussed. The papiliform structures found in the maxillae and the porous structures of the caudal setae of all species examined may have chemosensory function. Further studies with transmission electron microscopy are needed to better understand the physiological function of these external structures.
Revista Brasileira de Epidemiologia, 2006
The village of Pitinga, Presidente Figueiredo, AM, is a mining area and endemic for American Cuta... more The village of Pitinga, Presidente Figueiredo, AM, is a mining area and endemic for American Cutaneous Leishmaniasis (ACL). The village is the administrative office of the mine and where mining workers live. This study presents the profile of ACL in the 2000-2004 period. The highest prevalence of ACL occurs in male individuals with forest-related activities. The reduction in the number of ACL cases in the study area was not observed in the municipality and the state, a fact probably related to the disease control measures put into practice in the area.
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Papers by Felipe Arley Costa Pessoa