Sandfly frequency in a clean and well-organized rural environment in the state of Paraná, Brazil

Legriffon, Cristiane Machado de Oliveira; Reinhold-Castro, Kárin Rosi; Fenelon, Vanderson Carvalho; Neitzke-Abreu, Herintha Coeto; Teodoro, Ueslei

doi:10.1590/s0037-86822012000100015

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…In agreement with other studies (Massafera et al 2005, Salomón et al 2006, Galati et al 2009, de Oliveira Legriffon et al 2012, Fernández 2012) where the pigsty greatly exceeded the abundances of sandflies in the other environments of the peridomicile, in this work the pigsty was recorded as the environment that obtained the highest records of sandflies from its installation until its removal, without affecting the total abundance of Ny. whitmani in the farm.…”

Section: Discussionsupporting

confidence: 93%

“…Secondly, the number of samples in the different environments was unbalanced mainly due to the installation of the pigsty by the farmer 3 yr after the beginning of the study. Although, such installation was not anticipated by the researchers when defining the original experimental design, its potential epidemiological importance, previously described (Massafera et al 2005, Salomón et al 2006, Galati et al 2009, de Oliveira Legriffon et al 2012, Fernández 2012), made its inclusion as an additional environment imperative. The statistical analysis had to be adapted in view of this situation, nevertheless the results obtained in relation to the presence of the pigsty are one of the strengths of the present work.…”

Section: Discussionmentioning

confidence: 99%

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Population dynamics of Nyssomyia whitmani (Diptera: Psychodidae) in domestic and peridomestic environments in Northeast Argentina, a tegumentary leishmaniasis outbreak area

Manteca-Acosta

Cueto

Poullain

et al. 2023

Journal of Medical Entomology

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In the present study, the temporal dynamics of the main vector of Leishmania braziliensis, Nyssomyia whitmani, was measured by monthly captures of phlebotominae sandflies during 5 consecutive years (from 2011 to 2016) in the Paranaense region of South America. The captures were performed in environments where the human–vector contact risk is high: domiciliary and peridomiciliary environments in a rural area endemic of tegumentary leishmaniasis. Nyssomyia whitmani was recorded as the dominant species of the phlebotominae ensemble in all domiciliary and peridomiciliary environments (House, Chicken Shed, Pigsty, and Forest Edge). Using generalized additive models, intra- and interannual fluctuations were observed, modulated by meteorological variables such as the minimum temperature and the accumulated precipitation 1 wk prior to capture. The installation of a pigsty by the farmer during the study period allowed us to observe and describe the so-called “pigsty effect” where the Ny. whitmani population was spatially redistributed, turning the pigsty as the environment that obtained the highest phlebotominae record counts, thus maintaining the farm overall abundance, supporting the idea that the environmental management of the peridomicile could have an impact on the reduction of epidemiological risk by altering the spatial distribution of the phlebotominae ensemble in the environments.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Population dynamics of Nyssomyia whitmani (Diptera: Psychodidae) in domestic and peridomestic environments in Northeast Argentina, a tegumentary leishmaniasis outbreak area

Manteca-Acosta

Cueto

Poullain

et al. 2023

Journal of Medical Entomology

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“…Of course, urban services, paved streets or distance to the river are not modifiable variables but other variables were associated with "hot spots" at different scales including the microscale site of collection. For instance, the recommendations could include planned vegetation coverage with selected tree species, few plant-pots and deforested belts to increase the distance from forest edge, improved quality of houses (openness), garbage management and water drainage, reduced accessibility to chickens or other bloodmeal sources (by increasing the distance from pens to house) [5,7,20,21,[53][54][55][56].…”

Section: Sitementioning

confidence: 99%

Multiscale environmental determinants of Leishmania vectors in the urban-rural context

et al. 2020

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Background In South America, cutaneous leishmaniasis (CL) and visceral leishmaniasis (VL) are emerging diseases, expanding in the border area of Argentina, Brazil and Paraguay. Outbreaks of CL were reported since the 1990s, with Nyssomyia whitmani as the main vector in this region. Regarding VL, urban reports started in 2010 with Lutzomyia longipalpis as the main vector. The aim of this study was to evaluate environmental determinants related to the main vectors of leishmaniasis, to contribute to the prevention and control response to the emergence of VL and CL in the Argentina-Brazil-Paraguay border region. Methods The cross-sectional survey includes two cities and two close rural areas in the Argentinean Northeast Region, between November 2014 and January 2015, with a total of 95 sampling sites. REDILA-BL traps were set for three consecutive nights, and a total of 68 meso- and microscale environmental and landscape characteristics were surveyed. The association between vector abundance with different variables was evaluated using a generalized linear model with zero-inflated negative binomial distribution. We analyzed females for detection of Leishmania DNA. Results The analysis for Lu. longipalpis indicates an excess of absences when the mean NDWI around the sites were higher. The abundance of Lu. longipalpis at mesoscale level was higher when more urban services were present, and when blood sources such as chickens or dogs at the microscale level were present. For Ny. whitmani, no variable was found to be associated with the absences, while its abundance increased in association with the following variables: percentage of tree cover, presence of garbage collection service, hosted people and, at microscale, the presence of poultry. Leshmania infantum DNA was detected in 2/49 (4%) Lu. longipalpis. Conclusions The abundance of both species is influenced by variables at different scales, their influence probably has a hierarchy and they are acting on different aspects of the biology of these vectors. The urban spatial segregation of Lu. longipalpis and the peri-urban and rural segregation of N. whitmani increase the risk of VL and CL. The selection of the better variables for each scale will allow the design of appropriate control strategies depending on species.

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“…In particular, this expansion has replaced traditional crops with crops that are more productive, which has led to changes in sandflies populations related to altered patterns of dispersal and spatial distribution of these species in new areas [10–14], because these changes may involve a greater risk of transmission [3, 15]. Thus, an understanding between habitat variation and sandflies populations is essential, and to examine whether these changes can increase the risk of transmission of Leishmania , we studied populations of sandflies in a conserved area and two distinct agroecosystems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Environmental Disturbance on the Population of Sandflies andLeishmaniaTransmission in an Endemic Area of Venezuela

Nieves

Oraá

Rondón

et al. 2014

Journal of Tropical Medicine

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The exploitation of new wilderness areas with crops is increasing and traditional crop substitution has been modified by new more productive crops. The results show the anthropogenic disturbance effect on the sandflies population and Leishmania transmission in endemic areas of Venezuela. Three agroecosystems with variable degrees of ecological disturbance, forest (conserved), cacao (fragmented), and orangery (disturbed), were selected. Four methods to sandfly capture were used; the specimens were identified and infected with Leishmania. Diversity, population structure, ANOVA, Tukey test, and simple correlation analysis were carried out. Shannon traps were able to capture 94.7% of the total sandflies, while CDC light traps, Sticky traps, and direct suction just captured 2.2%, 1.2%, and 0.9%, respectively. The results showed the effect of ecological disturbance degree on the composition of sandflies and population structure, revealing a dominance level increased but decreased on the diversity and richness of sandflies species in the greatest ecological disturbance area in relation to areas with less organic disturbance. Environments more disturbed cause adaptability of certain species such as Lutzomyia gomezi and Lutzomyia walkeri. These changes on the composition of sandflies population and structure emerging species could cause increasing of leishmaniasis transmission.

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Sandfly frequency in a clean and well-organized rural environment in the state of Paraná, Brazil

Cited by 10 publications

References 31 publications

Population dynamics of Nyssomyia whitmani (Diptera: Psychodidae) in domestic and peridomestic environments in Northeast Argentina, a tegumentary leishmaniasis outbreak area

Population dynamics of Nyssomyia whitmani (Diptera: Psychodidae) in domestic and peridomestic environments in Northeast Argentina, a tegumentary leishmaniasis outbreak area

Multiscale environmental determinants of Leishmania vectors in the urban-rural context

Effect of Environmental Disturbance on the Population of Sandflies andLeishmaniaTransmission in an Endemic Area of Venezuela

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