versión impresa ISSN 0037-8682
Rev. Soc. Bras. Med. Trop. vol.43 no.5 Uberaba sept./oct. 2010
Capturas de flebotomíneos com armadilhas de Disney em área de ocorrência de Leishmania (Leishmania) amazonensis no estado de Mato Grosso do Sul, região Centro-Oeste do Brasil
Maria Elizabeth Cavalheiros DorvalI; Tulia Peixoto AlvesI; Geucira CristaldoI; Hilda Carlos da RochaI; Murilo Andrade AlvesI; Elisa Teruya OshiroI; Alessandra Gutierrez de OliveiraI; Reginaldo Peçanha BrazilII; Eunice Aparecida Bianchi GalatiIII; Rivaldo Venancio da CunhaI
IFederal University of Mato Grosso do Sul, Campo Grande, MS, Brazil
IIOswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, RJ, Brazil
IIIDepartment of Epidemiology, Public Health Faculty, University of São Paulo, São Paulo, SP, Brazil
INTRODUCTION: The work was conducted to study phlebotomine fauna (Diptera: Psychodidae) and aspects of American cutaneous leishmaniasis transmission in a forested area where Leishmania (Leishmania) amazonensis occurs, situated in the municipality of Bela Vista, State of Mato Grosso do Sul, Brazil.
METHODS: The captures were conducted with modified Disney traps, using hamster (Mesocricetus auratus) as bait, from May 2004 to January 2006.
RESULTS: Ten species of phlebotomine sandflies were captured: Brumptomyia avellari, Brumptomyia brumpti, Bichromomyia flaviscutellata, Evandromyia bourrouli, Evandromyia lenti, Lutzomyia longipalpis, Psathyromyia campograndensis, Psathyromyia punctigeniculata, Psathyromyia shannoni and Sciopemyia sordellii. The two predominant species were Ev bourrouli (57.3%) and Bi flaviscutellata (41.4%), present at all sampling sites. Two of the 36 hamsters used as bait presented natural infection with Leishmania. The parasite was identified as Leishmania (Leishmania) amazonensis.
CONCLUSIONS: Analysis of the results revealed the efficiency of Disney traps for capturing Bichromomyia flaviscutellata and the simultaneous presence of both vector and the Leishmania species transmitted by the same can be considered a predictive factor of the occurrence of leishmaniasis outbreaks for the human population that occupies the location.
Key-words: Phlebotominae. Bichromomyia flaviscutellata. Animal bait. Natural infection.
INTRODUÇÃO: O estudo foi realizado com o objetivo de estudar a fauna de flebotomíneos (Diptera: Psychodidae) e aspectos ligados à transmissão da leishmaniose tegumentar americana em uma área florestal com ocorrência de Leishmania (Leishmania) amazonensis, situada no município de Bela Vista, Estado do Mato Grosso do Sul, Brasil.
MÉTODOS: As capturas de flebotomíneos foram realizadas utilizando-se armadilhas tipo Disney modificadas, com isca roedor, Mesocricetus auratus, no período de maio de 2004 a janeiro de 2006.
RESULTADOS: As coletas resultaram na identificação de 10 espécies de Phlebotominae: Brumptomyia avellari, Brumptomyia brumpti, Bichromomyia flaviscutellata, Evandromyia bourrouli, Evandromyia lenti, Lutzomyia longipalpis, Psathyromyia campograndensis, Psathyromyia punctigeniculata, Psathyromyia shannoni e Sciopemyia sordellii. As duas espécies predominantes foram Ev bourrouli, com 57,3% dos espécimes coletados, e Bi. flaviscutellata, representada por 41,4% e que esteve presente em todos os locais amostrados. Dois hamsters sentinelas adquiriram a infecção natural, sendo os isolados identificados como Leishmania amazonensis.
CONCLUSÕES: Os resultados mostram a eficiência das armadilhas Disney para captura de Bichromomyia flaviscutellata, e a presença simultânea de ambos, o vetor e a espécie de Leishmania por ele transmitida pode ser considerada um fator preditor da ocorrência de leishmaniose para a população humana que permanecer nesse local.
Palavras-chaves: Phlebotominae. Bichromomyia flaviscutellata. Isca animal. Infecção natural.
Leishmaniasis have been regarded as an important public health problem in Mato Grosso do Sul over the last ten years. A rich variety of sandfly species in different ecotopes has been identified in several ecological studies conducted in this state. These studies have indicated new species or have reinforced the role that some of them play in the transmission of leishmaniasis to the population of different municipalities, contributing to current understanding of the epidemiology of these diseases in the state1-6.
The identification of phlebotomine sandflies, their habits, their indices of infection with different Leishmania species and knowledge concerning the relationship between them and their vertebrate and invertebrate hosts are essential for understanding leishmaniasis epidemiology, assisting prevention and surveillance measures in the areas where the disease occurs7,8.
Reports of Bichromomyia flaviscutellata in Mato Grosso do Sul are relatively recent2,6, as is the confirmation of human and animal cases of American cutaneous leishmaniasis (ACL) associated with Leishmania (Leishmania) amazonensis infection9,10. With the purpose of improving current understand regarding leishmaniasis epidemiology in the municipality of Bela Vista, MS, an area in which human cases occur, investigation of the phlebotomine fauna attracted to Disney traps was conducted using hamsters as baits, a recognized attraction for L. amazonensis vectors.
The municipality of Bela Vista (SL: 22º06'32" and WL: 56º31'16") is located in the southwestern region of the State of Mato Grosso do Sul, in the geographical microregion of Bodoquena. It has an area of 5,315 km2 (2,050 mi2) and its borders are: the municipality of Jardim to the north; The Republic of Paraguay to the south, the municipality ofAntônioJoão to the east and the municipality of Caracol to the west. Bela Vista is located on the border of the River Apa, opposite the Bella Vista district, Paraguay; its altitude is 180m above sea level and the distance from the state capital, Campo Grande, is 349km (217mi)11.
According to the Brazilian Institute of Geography and Statistics (Instituto Brasileiro de Geografia e Estatística, IBGE)12, of the original vegetation cover recorded for the region, only a few seasonal semideciduous forest-like formations are left. The vegetation predominantly consists of savannah-like formations, seasonal forest and savannah.
The work was conducted in a reserve area belonging to the 10th Mechanized Cavalry Regiment (10º Regimento de Cavalaria Mecanizado, 10º RCMec), located in the urban area and systematically used for military training.
Capture of sandflies
Six modified Disney traps13, associated with rodent bait, hamster (Mesocricetus auratus), were used. The hamsters were maintained in plastic cages in accordance with population density recommendations14, with a bed of wood shavings consisting of Pinnus sp, and were offered water and commercial ration Nuvilab CR-1® (Nuvital, Curitiba, PR, Brazil) ad libitum. The cages were cleaned and the feed complemented on a weekly basis.
Thirty-six hamsters of both sexes, originating from the animal house of the Laboratory of Parasitology/Department of Pathology of the Federal University of Mato Grosso do Sul (Universidade Federal de Mato Grosso do Sul, UFMS) were used.
The traps were installed in the woods, about 20cm from the ground, with changes of the sentinel animal every three months or when the general condition of the hamster was impaired (wasting, fur alteration, skin lesions). Once a week, a military officer trained by the research teamexamined the hamsters forpossible lesions. When the hamster was taken out of the trap, it was maintained in the animal house of the Laboratory of Parasitology of UFMS for eight months so that Leishmania infection could be investigated.
The catches began in May 2004 and ended in April 2006.
The insects attracted to the hamster adhered to plates previously smeared with castor oil and, on a weekly basis, were collected with the aid of a soft, thin-ended brush, stored in flasks with isopropanol and maintained in the refrigerator until identification. The females were identified through exposure and morphological recognition of the genitalia; and the males, after clarification in the Laboratory of Parasitology. Specific identification and terminology were performed according to Galati15.
Williams Geometric Mean16 was used to quantify the frequency of some data.
Due to the nonexistence of meteorological data for the town, climate records from the Meteorological Station of the Airport of Ponta Porã, MS (Southwestern Regional Superintendency/Navigation Management), located approximately 100km (62mi) from Bela Vista, were used.
This study was approved by the Ethics Committee on the Use of Animals (Comissão de Ética no Uso de Animais, CEUA) of the UFMS, protocol no. 109/2006.
A total of 1,191 sandflies (622 males and 529 females) belonging to 10 species were collected: Bichromomyia flaviscutellata, Brumptomyia avellari, Brumptomyia brumpti, Evandromyia bourrouli, Evandromyia lenti, Lutzomyia longipalpis, Psathyromyia campograndensis, Psathyromyia punctigeniculata, Psathyromyia shannoni and Sciopemyia sordellii.
Table 1 presents the total number of species captured at the different sites. The male/female ratio for all specimens collected was 1.2:1.0, influenced by the large number of Ev bourrouli males. For Bichromomyia flaviscutellata, the ratio was 1:16.6, indicating a higher attraction of females to the traps.
The two predominant species were Ev bourrouli, accounting for 57.3% of the specimens, and Bichromomyia flaviscutellata, accounting for 41.4% and present at all the sites. The other species were sporadically present in the traps, in total, accounting for 1.3% of the overall specimens.
Among the capture sites, the Survival Station (Pista de Sobrevivência) and the First Aid Station (Pista de Primeiros Socorros) presented the highest density of specimens, 70.1% and 16.5%, respectively.
Evandromyia bourrouli, captured only in the Survival Station, had a high density and presented a peak in November and December 2005, with 99.9% (681) of the specimens collected during the entire sample period.
In the first year of study, observations were severely impaired due to the constant changes in the trap sites due to theft episodes. Thus, for plotting graphs and analysis of seasonal distribution, only specimens of Bichromomyia flaviscutellata captured between May 2005 and April 2006 were used.
The monthly rainfall, the monthly average temperature and the Bichromomyia flaviscutellata frequencies are plotted in Figure 1. The species was captured practically throughout the entire year, with an abrupt fall in October associated with drier periods.
The seasonal distribution of Bi flaviscutellata females obtained by Williams' Geometric Mean is shown in Figure 2. The highest values occurred in winter, when the captures were at least 3.5 times higher than those in other seasons.
Among the 36 sentinels exposed during the whole period in the area, two of them presented ACL-like lesions. The parasite was characterized as Leishmania (Leishmania) amazonensis. The hamsters had been placed in traps installed in the Survival Station in March 2006 and were removed in early May, when field work was completed.
Depending on aspects inherent to the behavior of phlebotomine, such as light attraction, feeding habitsandtropisms, thecapturemethods offer diverse estimates on the relative abundance of different species17.
The results obtained with Disney traps complement information concerning the phlebotomine fauna in the area under study. Automatic light traps and Shannon traps were used and 354 and 454 specimens, belonging to 18 species of phlebotomine, were captured, respectively18.
The efficiency of Disney traps for Bichromomyia flaviscutellata was evident, as this was the second most abundant species when both sexes were considered, and the first in relation to females. With the other two methods, automatic light traps and Shannon traps, the species was present in low density, 1.1% and 5.9%, respectively. This indicates the low level of light and man attraction to Bichromomyia flaviscutellata. This species is recognized as the main vector of L. amazonensis19-21. Although it is reported as predominant in anthropophilic phlebotomine fauna in areas of non-climatic vegetation cover in the Amazon22, it is still regarded as a species with nocturnal habits, barely attracted to man23-27. This is a strictly wild species, found mostly in humid forests, especially those temporarily flooded27. However, it has been shown to be resistant to ecological changes and adaptable to different types of vegetation22,28,29. It is found in anthropic environment6,28, 30-32, which could contribute to increasing its distribution area in the country.
In the kind of trap used, in which neither human nor light interference occurs, the capture of a large number of female specimens reflects the greater power of attraction of the animal bait, corroborating the statement that this species has feeding preference for rodents19,22,26.
Although species of wild rodents, proven reservoirs of L. amazonensis, have not been used as baits and further studies regarding these animals are needed, the simultaneous presence of both the vector and the Leishmania species transmitted by the same9 may be considered a predictive factor of the occurrence of leishmaniasis outbreaks when the military staff remain in the site at night.
Although a larger number of specimens have been captured in the First Aid Station and in the Survival Station, Bi flaviscutellata was present in all the traps, which indicates that it is either distributed throughout the training area or actively spreads in search of food. The large amount of organic material deposited in the forest soil, such as leaves and the remains of decomposing plants, equine feces and leftovers, as well as the dense vegetation with predominance of arborous extract with leaf-falling species surrounding a glade, may favor the occurrence of breeding sites. On the other hand, anthropic wastes may favor the rodent populations, which, as previously noted, are attractive to Bichromomyia flaviscutellata.
While studying the seasonal variation of Bichromomyia flaviscutellata in forested areas, Shaw and Lainson27 observed that during the driest season, from June through November, the population of these insects increased, reaching its peak around December. In the area studied, the fact that the Williams' Geometric Mean was 3.5 times higher in the winter in relation to other seasons also indicates that the highest frequency of the species is associated with the driest period. The peak observed at the end of the summer may be explained by the fact that a larger quantity of Bi. flaviscutellata individuals remained in larval stage for a longer period, when the soil was still excessively humid.
The use of such an area for military training occurs between March and May, when there is a greater offer of food to rodents, attracted to anthropic wastes, which may lead to greater circulation of L. amazonensis. In addition, a peak of Bichromomyia flaviscutellata was observed, which might explain the natural infection caused by L. amazonensis in the sentinel in March.
Thus, when verifying higher regularity of Bichromomyia flaviscutellata specimens during the driest period ( July-September), it can be concluded that the risk of ACL transmission also increases if the human population is exposed in the area.
However, in periods in which averages are not so high, as occurred at the end of the summer, the risk of parasitic transmission may also occur, since, depending on climate and endogenous factors of Bichromomyia flaviscutellata species, it could present an abrupt increase in density, i.e., show explosive behavior. Moreover, if the vector explosion and the exposure of military personnel for training coincide, as reported during the analyzed period, outbreaks may occur. A case in point is the probable period of infection already reported for human cases9. The confirmation of natural infection of the sentinel exposed during the peak of this species (March) reinforces this point.
In compliance with these observations, it is suggested that military training in the forested area should occur from November through February, when Bichromomyia flaviscutellata density is diminished.
Evandromyia bourrouli, a species whose habitat includes forests and armadillo burrows33, was captured in high density by this method, and the fact that practically all females were engorged seems to determine their rodentophilic habit. In captures conducted with light traps, the result is always lower and the specimens are collected in both forested areas and anthropic environment, especially in the mid-western and north-eastern regions6,28,34.
The larger number of Ev bourrouli males may be attributed to factors already reported for other species of sandflies and traps, such as the installation of traps close to insect breeding and sheltering sites; the attraction of the males for copula during feeding and the males releasing pheromones, thus attracting more specimens of the same sex10,35-38. When comparing males and females captured in Disney traps, the collection of a reduced number of Evandromyia bourrouli bourrouli females (14.7%), compared to Bichromomyia flaviscutellata (94.3%), not only indicates a higher preference of the latter for rodents, but also seems to show distinct behavior of the respective males. It is possible that Ev. bourrouli males are more attracted to kairomones liberated by vertebrates39 and that they liberate aggregation pheromones and then attract other males. These characteristics are absent or less enhanced in Bichromomyia flaviscutellata.
Analysis of the results showed that, similar to other areas of ACL occurrence in the State of Mato Grosso do Sul4,40,41, disease transmission is associated with wild vector patterns and with human exposure to vectors in their natural habitat.
Thus, despite recognizing the importance of military training, especially as far as the defense of the country's frontiers is concerned, it is necessary to plan such activities for periods of lower vector density and to design measures of individual protection, in an attempt to reduce the contact with the vector and the risk of acquiring the parasite.
The authors would like to thank the Command and the military of the 10º RCMec for their unconditional support for the study and the research team; the Coordenadoria de Controle de Vetores da Secretaria de Estado de Saúde, especially Mr. Elias Monteiro, for logistic support, and Mr. João Anastácio, for his collaboration in the field work; Military servicemen André Flávio Maria Zimmermann and Claudemar Borges Dias, for the usual reception and tireless collaboration in the captures; and Dra. Elisa Cupolillo for the identification of the parasite.
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest.
Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e tecnologia do Estado de Mato Grosso do Sul-FUNDECT/DECIT (00645-03), UFMS.
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Dra. Maria Elizabeth Cavalheiros Dorval
Laboratório de Parasitologia/DPA/CCBS/UFMS
Caixa Postal 549
79070-900 Campo Grande, MS, Brasil
Phone: 55 67 3345-7369; Fax: 55 67 3345-7314
Received in 22/04/2010
Accepted in 21/07/2010