Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 22
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Trop Med Infect Dis ; 9(6)2024 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-38922037

RESUMO

Diverse larval habitats significantly influence female mosquito oviposition. Utilizing traps that simulate these habitats is helpful in the study of the bioecology and characteristics of pathogen-transmitting species during oviposition. This study evaluated the feasibility of different traps in natural environments by comparing sampling methods and detecting the oviposition of epidemiologically important mosquitoes, with emphasis on Haemagogus species, in a fragment of the Atlantic Forest in Silva Jardim, Rio de Janeiro State, Brazil. Monthly collections were conducted from March 2021 to October 2023 using four types of traps: plastic containers, tires, bamboo, and sapucaia. Immatures were collected from these traps using a pipette, placed in plastic bags, and transported to the laboratory. Tire was the most efficient trap, showing the highest mosquito abundance (n = 1239) and number of species (S = 11). Conversely, the plastic container trap exhibited the lowest diversity (H = 0.43), with only two species and a low mosquito abundance (n = 26). The bamboo trap captured six species and recorded the second-highest diversity index (H = 1.04), while the sapucaia trap captured five species and had the third-highest diversity index (H = 0.91). Of the total immatures collected, 1817 reached adulthood, comprising 13 species, two of which are vectors of the sylvatic yellow fever virus: Haemagogus leucocelaenus and Haemagogus janthinomys. In conclusion, detecting key vectors of the sylvatic yellow fever virus in Brazil highlights the need for ongoing entomological and epidemiological surveillance in the study area and its vicinity. These efforts are crucial for monitoring vector presence and activity, identifying potential transmission hotspots, and devising effective control and prevention strategies.

2.
Life (Basel) ; 14(3)2024 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-38541677

RESUMO

Although tropical forests are home to most of the global diversity, they suffer from the most significant knowledge gaps concerning their fauna. Despite its high biodiversity, Brazil is facing an alarming destruction of habitats, with species becoming extinct before they can be discovered or described via science. Therefore, there is an urgent need to expand wildlife inventories, including entomofauna surveys. The present study aimed to analyze the bionomic aspects and the influence of abiotic factors on mosquito fauna whose immature phases develop in two bamboo species, Guadua tagoara and Bambusa vulgaris, in Tijuca National Park, Rio de Janeiro, Brazil. Immatures were collected in 10 artificially drilled bamboo plants, in five stalk internodes per plant, at two sampling points, from March 2022 to March 2023, during 23 collections. A total of 1845 immatures were obtained, 72.14% at sampling point 1 and 27.86% at sampling point 2. Of this, 1162 individuals reached adulthood, belonging to the following species: Culex iridescens, Culex neglectus, Haemagogus leucocelaenus, Orthopodomyia albicosta, Sabethes identicus, Sabethes melanonymphe, Sabethes purpureus, Toxorhynchites bambusicola, Toxorhynchites sp., Trichoprosopon compressum, Trichoprosopon pallidiventer, Wyeomyia arthrostigma, Wyeomyia codiocampa, Wyeomyia lutzi, Wyeomyia oblita, Wyeomyia personata, Wyeomyia serrata, and Wyeomyia sp. The Tijuca National Park is a tourist spot and receives a large number of visitors. Thus, humans can become an accessible food source for mosquitoes in this area, making the species survey critical since important arbovirus vectors have been recorded in Rio de Janeiro.

3.
BMC Zool ; 9(1): 6, 2024 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-38515212

RESUMO

BACKGROUND: Rhodnius zeledoni was described from a single specimen. Since its description, doubts have arisen regarding the taxonomic status of this species in relation to Rhodnius domesticus. METHODS: The present study reviewed and compared R. zeledoni with R. domesticus based on morphological analysis and head geometric morphometrics. RESULTS: Our analysis revealed the absence of distinctive diagnostic characters between the two species at specific levels. Rhodnius zeledoni and R. domesticus show morphological and morphometric similarity, with only minor differences in coloration observed between them. Contrary to previous statements, our analysis showed that R. zeledoni and R. paraensis are not closely related species, not corroborating previous studies with such an assumption. CONCLUSIONS: Therefore, we formally propose R. zeledoni as a junior synonym of R. domesticus.

4.
Rev Soc Bras Med Trop ; 56: e01502023, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37493742

RESUMO

BACKGROUND: Triatominae are vectors of the protozoan Trypanosoma cruzi, the causative agent of Chagas disease. This study aims to report an infestation on Triatominae colonies by a beetle, previously identified as a pest. METHODS: The management of these colonies should be improved to maximize their usefulness, and factors that may cause harm to them should be avoided as much as possible. RESULTS: This is the first report on a coleopteran infestation on living Triatominae colonies worldwide. CONCLUSIONS: The present record provides an important warning to researchers who maintain insectaries in general, especially those who rear triatomines, to carry protective measures against such invasions.


Assuntos
Doença de Chagas , Besouros , Reduviidae , Triatominae , Trypanosoma cruzi , Animais , Insetos Vetores
5.
Trop Med Infect Dis ; 8(5)2023 Apr 23.
Artigo em Inglês | MEDLINE | ID: mdl-37235288

RESUMO

Currently, there are 158 valid species of triatomines, all of which are potential vectors of Trypanosoma cruzi, the etiological agent of Chagas disease. The correct taxonomic identification of triatomines is essential since each species hos a different epidemiological importance. The aim of the study is to compare five species of South American Triatoma. Here we present a comparative study of terminal abdominal segments in females by scanning electron microscopy (SEM) of the species Triatoma delpontei, T. jurbergi, T. infestans var. melanosoma, T. platensis, and T. vandae. The results showed diagnostic characters for the studied species. The dorsal view featured more valuable characters, with seven informative characters. Similarities were observed among T. delpontei, T. infestans var. melanosoma, and T. platensis, and between T. jurbergi and T. vandae, correlating with previous studies. Thus, female genital characters proved to be reliable and useful in the diagnosis of the Triatoma species studied here; additional studies, along with other sets of behavioral, morphological, and molecular data, helped to reinforce the hypotheses found here.

6.
Rev. Soc. Bras. Med. Trop ; 56: e0150, 2023. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1449340

RESUMO

ABSTRACT Background: Triatominae are vectors of the protozoan Trypanosoma cruzi, the causative agent of Chagas disease. This study aims to report an infestation on Triatominae colonies by a beetle, previously identified as a pest. Methods: The management of these colonies should be improved to maximize their usefulness, and factors that may cause harm to them should be avoided as much as possible. Results: This is the first report on a coleopteran infestation on living Triatominae colonies worldwide. Conclusions: The present record provides an important warning to researchers who maintain insectaries in general, especially those who rear triatomines, to carry protective measures against such invasions.

7.
Insects ; 13(7)2022 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-35886767

RESUMO

Triatoma guazu Lent and Wygodzinsky and Triatoma williami Galvão, Souza, and Lima (Hemiptera: Triatominae) are found in human dwellings and are potential vectors of the protozoan Trypanosoma cruzi, the etiological agent of Chagas disease. Triatoma guazu was described based solely on a single female specimen, from the municipality of Villarica, Guairá Department, Paraguay, and posteriorly, a male from Barra do Garças, Mato Grosso, Brazil was described and designated as the allotype of this species. Triatoma williami is found in the central-west of Brazil between Goiás, Mato Grosso, and Mato Grosso do Sul. However, the taxonomic "status" of these species is questioned. Previous studies indicate the lack of isoenzymatic diagnostic loci, morphometric similarity, low genetic divergence, and close evolutionary relationship of these species. In this study, we compared the morphology, morphometry, and mitochondrial DNA fragments of the populations of the two species. The morphological diagnostic characteristic among these species is the difference in the connexivum spots pattern, which has been recognized as a phenotypic variation that exists among populations resulting from ecological diversity. Furthermore, our analysis also revealed the morphometric similarity and low genetic divergence between these species. Therefore, in the present paper, we formally propose T. guazu as a junior synonym of T. williami.

8.
J Med Entomol ; 59(2): 446-453, 2022 03 16.
Artigo em Inglês | MEDLINE | ID: mdl-35026036

RESUMO

This study registers the diversity of Culicidae in the Bom Retiro Private Natural Heritage Reserve (RPPNBR), Rio de Janeiro state, Brazil, based on the collection of the immature stages in natural and artificial larval habitats. Larvae and pupae were collected monthly at two sites of the RPPNBR from May 2014 to July 2015 using dippers and aquatic pipettes. The diversity of the mosquito community was described using the Shannon-Wiener Diversity Index (H'), as well as diversity, richness, and dominance of species found in different larval habitats (lake, bamboos, bromeliads, and artificial vessels). The Mann-Whitney test was used to calculate differences between the two natural and artificial habitats. Overall, 15,659 specimens belonging to 25 species, ten genera, and two subfamilies were collected. The most abundant species collected at sites that were reforested recently were Culex pleuristriatus Theobald, 1903, Limatus durhamii (Theobald, 1901), Aedes albopictus (Skuse, 1895), Culex neglectus (Lutz, 1904), and Culex retrosus (Lane & Whitman, 1951). In a forest preserved site, the most abundant species were Cx. neglectus, Culex iridescens (Lutz, 1905), Sabethes identicus (Dyar & Knab, 1907), Wyeomyia arthrostigma (Lutz, 1905), and Li. durhamii. With respect to larval habitats, 0.1% of the specimens were collected along the edge of a lake, 5.5% in bamboos, 35.9% in bromeliads, and 58.4% in artificial containers. Only 5.5% of the specimens were collected in the forest preserved site, with the remaining samples from the site with altered vegetation. A greater species richness and diversity were found in forest-altered sites compared to the forest preserved site. Several species were collected in the water accumulated in the nylon lids of plastic water tanks. Such vessels can promote an increase in mosquito population density in the environment surrounding the study area.


Assuntos
Aedes , Culex , Culicidae , Animais , Brasil , Florestas , Larva , Água
9.
J Am Mosq Control Assoc ; 37(4): 208-215, 2021 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-34817616

RESUMO

Living bamboo stalks are one of the most specialized habitats for mosquito oviposition and immature development. Most of the mosquito species that breed in these habitats are sylvatic, and some are of importance for public health as possible vectors of pathogens. Perforated internodes are a very specialized environment due to the difficulty of access. Furthermore, due to their relatively simple fauna, they represent a valuable model for ecological studies that may be applicable to more complex environments. This study aims to assess the mosquito bionomics of species raised in bamboo internodes. Therefore, the diversity of mosquito species and the influence of abiotic variables (pH and temperature) on the distribution of mosquitoes that breed in this habitat were analyzed. The study area is a fragment of Atlantic Forest within the Association of da Armada (ATA) in Nova Iguaçu, state of Rio de Janeiro, Brazil. Immature mosquitoes were sampled with suction tubes (mouth aspirators) between August 2017 and July 2018. A total of 3,170 larvae were collected in 5 bamboo plants, each with 8 stalks perforated. Of these, 688 larvae reached the adult stage, representing 10 genera and 19 species. The most common species were Culex neglectus (43%), Trichoprosopon digitatum (22%), Culex iridescens (8%), Sabethes identicus (7%), and Orthopodomyia albicosta (7%). The richness of the immatures collected in the ATA was 19 species, with a diversity of 1.10 and Shannon evenness of 0.57. A diverse composition of Culicidae in bamboo stalks was found, although dominance was low.


Assuntos
Culicidae , Animais , Brasil , Ecologia , Feminino , Florestas , Mosquitos Vetores
10.
Vector Borne Zoonotic Dis ; 21(11): 875-883, 2021 11.
Artigo em Inglês | MEDLINE | ID: mdl-34652248

RESUMO

Mosquitoes transmit several pathogens in tropical regions, especially in forest areas. The diseases caused by these pathogens include malaria and several arboviruses such as yellow fever. Brazil has the largest endemic area in the world for yellow fever. Many factors can affect the sylvatic cycle of the disease, shifting it into human-inhabited areas. This study aims to examine the oviposition behavior of mosquito species that are effective or potential vectors of the yellow fever virus and which colonize bamboo traps and ovitraps installed at different heights. The positions of the traps in the strata were changed every 15 days. The collection of immature stages (eggs, larvae, and pupae) was performed every 2 weeks for 12 months from August 2018 to July 2019 in the city of Nova Iguaçu, state of Rio de Janeiro, Brazil, in an area near the Tinguá Biological Reserve (REBIO) in the districts of Adrianópolis and Rio D'ouro. Statistical tests were used to compare oviposition at each stratum, and correlation tests showed the relationship between the presence of eggs and immature mosquitoes (larvae and pupae) and temperature, precipitation, and trap type. The diversity was calculated for each trap type and height, as well as the dry and rainy seasons. During the sampling period, 3929 eggs and 4953 larvae and pupae were collected. The traps installed in the high strata remained empty when traps on the ground were installed at the same time, although not when they were installed on their own. The results obtained with this new proposed methodology suggest that diversity is greatest in the rainy season and in bamboo traps for either stratum. Furthermore, this study suggests that mosquitoes begin searching for breeding sites at ground level. Higher levels may be occupied due to the absence or impermanence of other breeding sites.


Assuntos
Culicidae , Febre Amarela , Animais , Brasil , Feminino , Florestas , Mosquitos Vetores , Febre Amarela/veterinária , Vírus da Febre Amarela/genética
11.
Rev Soc Bras Med Trop ; 54: e01472021, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34105628

RESUMO

INTRODUCTION: The occurrence of Microtriatoma borbai in the state of Espírito Santo, Brazil is reported by the first time. METHODS: A triatomine specimen collected in a hybrid eucalyptus crop in the municipality of Aracruz, Espírito Santo state was found to be a male M. borbai. RESULTS: This finding expands the geographical distribution of M. borbai from four to five Brazilian states. It is the first report of M. borbai occurrence inside a eucalyptus crop. CONCLUSIONS: The occurrence of M. borbai in the state of Espírito Santo broadens the geographical distribution of this species in southeastern Brazil.


Assuntos
Eucalyptus , Reduviidae , Triatominae , Animais , Brasil , Meio Ambiente , Masculino
12.
Rev. Soc. Bras. Med. Trop ; 54: e0147 2021, 2021. graf
Artigo em Inglês | LILACS | ID: biblio-1250814

RESUMO

Abstract INTRODUCTION: The occurrence of Microtriatoma borbai in the state of Espírito Santo, Brazil is reported by the first time. METHODS: A triatomine specimen collected in a hybrid eucalyptus crop in the municipality of Aracruz, Espírito Santo state was found to be a male M. borbai. RESULTS: This finding expands the geographical distribution of M. borbai from four to five Brazilian states. It is the first report of M. borbai occurrence inside a eucalyptus crop. CONCLUSIONS: The occurrence of M. borbai in the state of Espírito Santo broadens the geographical distribution of this species in southeastern Brazil.


Assuntos
Animais , Masculino , Triatominae , Reduviidae , Eucalyptus , Brasil , Meio Ambiente
13.
Rev. Soc. Bras. Med. Trop ; 54: e01472021, 2021. graf
Artigo em Inglês | LILACS | ID: biblio-1288070

RESUMO

Abstract INTRODUCTION: The occurrence of Microtriatoma borbai in the state of Espírito Santo, Brazil is reported by the first time. METHODS: A triatomine specimen collected in a hybrid eucalyptus crop in the municipality of Aracruz, Espírito Santo state was found to be a male M. borbai. RESULTS: This finding expands the geographical distribution of M. borbai from four to five Brazilian states. It is the first report of M. borbai occurrence inside a eucalyptus crop. CONCLUSIONS: The occurrence of M. borbai in the state of Espírito Santo broadens the geographical distribution of this species in southeastern Brazil.


Assuntos
Triatominae , Reduviidae , Eucalyptus , Brasil , Meio Ambiente
14.
J Am Mosq Control Assoc ; 36(4): 245-248, 2020 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-33647111

RESUMO

In this study, traps were set out to improve mosquito monitoring, study their viability, and determine the most suitable traps for female mosquito species of epidemiological importance during oviposition. The effectiveness of 3 types of traps (bamboo traps, tire traps, and ovitraps) were compared at 2 sampling sites. A total of 24 traps were installed on the ground at elevations of 3 m, 6 m, and 9 m in a fragment of the Atlantic Forest in the municipality of Nova Iguaçu, Rio de Janeiro State, Brazil. The samplings took place every 2 wk from July 2017 to June 2018. A total of 1,854 mosquitoes belonging to 16 different species were identified, of which 2 species are involved in the transmission of arbovirus: Haemagogus leucocelaenus (Dyar and Shannon) and Aedes albopictus Skuse. Larval tire traps were the most effective at trapping females laying eggs, followed by ovitraps. The results were consistent with the usual habitats of certain species that were found in tire traps, which are artificial objects commonly found in human environments.


Assuntos
Culicidae , Entomologia/métodos , Animais , Biodiversidade , Brasil , Feminino , Florestas , Controle de Mosquitos
15.
Zootaxa ; 4565(1): zootaxa.4565.1.13, 2019 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-31716499

RESUMO

The ultrastructure and morphometry of the egg of Coquillettidia albifera (Prado) (Diptera: Culicidae) studied under scanning electronic microscopy is presented for the first time. The identification of the species was confirmed by examination of the genitalia of males collected with females. The male genitalia are redescribed and digital photographs are provided. The eggs are elliptical with the anterior region elongate and tubuliform, length 661 ± 2.59 µm and width 183 ± 2.59 µm (ratio length/width 3.61 ± 0.08). The dorsal surface is covered by a hexagonal, pentagonal and rectangular chorionic network with randomly distributed tubercles. The micropylar disc has a diameter of 18.91 ± 0.65 µm, surrounded by a continuous protuberant collar with a thickness of 4.4 ± 0.3 µm. No structure or vestige of cement related to egg attachment was observed.


Assuntos
Culicidae , Animais , Córion , Feminino , Genitália Masculina , Masculino , Microscopia Eletrônica de Varredura , Óvulo
16.
J Med Entomol ; 56(3): 849-858, 2019 04 16.
Artigo em Inglês | MEDLINE | ID: mdl-30649408

RESUMO

The present study evaluated the diversity of Anopheles Meigen, 1818 belonging to the subgenus Nyssorhynchus Blanchard, 1902 in four areas of Cachoeiras de Macacu municipality, Rio de Janeiro, Brazil. The immature collections were carried out during a rainy period and a post-rainy season. During the two periods, 3,932 specimens of Anopheles (Nyssorhynchus) were collected: 562 in the rainy period (14.29%) and 3,370 in the post-rainy period (85.70%). Among 3,932 specimens collected during both periods, 489 were identified, 50 (8.89%) in the rainy period and 439 (13.02%) in the post-rainy period. Nine Anopheles species were recorded: Anopheles albitarsis Lynch Arribálzaga, 1878 s.l. (76.86%), An. braziliensis (Chagas, 1907) (17%); An. evansae (Bréthes, 1926) (8, 48%); An. triannulatus (Neiva & Pinto, 1922) s.l. (8.23%); An. oswaldoi (Peryassú, 1922) (6.43%); An. strodei Root, 1926 (5.40%); An. argyritarsis Robineau-Desvoidy, 1827 (1.54%); An. rangeli Gabaldón et al., 1940 (1.28%); and An. aquasalis Curry, 1932 (0.51%). Among them, An. albitarsis was dominant and abundant in 93.75% of the collection points. Our results show a diverse Anopheles fauna in the municipality of Cachoeiras de Macacu, with a strong association of occurrence between An. rangeli and An. oswaldoi; An. rangeli and An. evansae; An. evansae and An. oswaldoi; and An. albitarsis s.l. and An. braziliensis during the rainy period. However, there was a weak correlation in the post-rainy period, except between An. rangeli and An. oswaldoi and between An. triannulatus and An. aquasalis, which displayed a moderate linear correlation. Our results suggest that following a potential reintroduction of malaria Cachoeiras de Macacu, local transmission of Plasmodium Marchiafava & Celli, 1885 may be enhanced by the presence of nine Nyssorhynchus species (all potential malaria vectors).


Assuntos
Distribuição Animal , Anopheles/fisiologia , Biodiversidade , Mosquitos Vetores/fisiologia , Animais , Brasil , Densidade Demográfica , Estações do Ano
17.
Rev Soc Bras Med Trop ; 51(2): 190-197, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29768552

RESUMO

INTRODUCTION: Chagas disease is caused by the protozoa Trypanosoma cruzi. Its main reservoir is the domestic dog, especially in rural areas with favorable characteristics for vector establishment and proliferation. The aims of this study were to collect data, survey and map the fauna, and identify T. cruzi infection in triatomines, as well as to assess the presence of anti-T. cruzi antibodies in dogs in rural areas of the municipality of Mossoró, Brazil. METHODS: An active entomologic research was conducted to identify adult specimens through an external morphology dichotomous key. The analysis of natural infection by T. cruzi in the insects was performed by isolation in culture and polymerase chain reaction. The antibody testing for T. cruzi in dogs was performed by enzyme-linked immunosorbent assay and indirect immunofluorescence assay. RESULTS: A total of 68 triatomines were captured, predominantly the Triatoma brasiliensis brasiliensis (Neiva 1911) species. The vector mapping displayed areas with greater risk for parasite transmission. Of the examined triatomines (51 specimens), 41.2% (21/51) were positive on polymerase chain reaction, and all were negative on culture. In the serum testing, 11% (25/218) of dogs were seropositive, but no association was found between the serologic results and the presence and infection by T. cruzi in triatomines. CONCLUSIONS: This study demonstrated the movement of T. cruzi in the studied area, by the presence of vectors and naturally infected domestic reservoirs. The mapping of the studied rural area demonstrates the risk of disease transmission.


Assuntos
Anticorpos Antiprotozoários/sangue , Doença de Chagas/veterinária , Doenças do Cão/diagnóstico , Insetos Vetores/parasitologia , Triatominae/parasitologia , Trypanosoma cruzi/imunologia , Animais , Brasil/epidemiologia , Doença de Chagas/diagnóstico , Doença de Chagas/epidemiologia , Doenças do Cão/epidemiologia , Cães , Técnica Indireta de Fluorescência para Anticorpo , Reação em Cadeia da Polimerase , Prevalência , População Rural
18.
Rev. Soc. Bras. Med. Trop ; 51(2): 190-197, Mar.-Apr. 2018. tab, graf
Artigo em Inglês | LILACS | ID: biblio-897070

RESUMO

Abstract INTRODUCTION: Chagas disease is caused by the protozoa Trypanosoma cruzi. Its main reservoir is the domestic dog, especially in rural areas with favorable characteristics for vector establishment and proliferation. The aims of this study were to collect data, survey and map the fauna, and identify T. cruzi infection in triatomines, as well as to assess the presence of anti-T. cruzi antibodies in dogs in rural areas of the municipality of Mossoró, Brazil. METHODS: An active entomologic research was conducted to identify adult specimens through an external morphology dichotomous key. The analysis of natural infection by T. cruzi in the insects was performed by isolation in culture and polymerase chain reaction. The antibody testing for T. cruzi in dogs was performed by enzyme-linked immunosorbent assay and indirect immunofluorescence assay. RESULTS: A total of 68 triatomines were captured, predominantly the Triatoma brasiliensis brasiliensis (Neiva 1911) species. The vector mapping displayed areas with greater risk for parasite transmission. Of the examined triatomines (51 specimens), 41.2% (21/51) were positive on polymerase chain reaction, and all were negative on culture. In the serum testing, 11% (25/218) of dogs were seropositive, but no association was found between the serologic results and the presence and infection by T. cruzi in triatomines. CONCLUSIONS: This study demonstrated the movement of T. cruzi in the studied area, by the presence of vectors and naturally infected domestic reservoirs. The mapping of the studied rural area demonstrates the risk of disease transmission.


Assuntos
Animais , Cães , Trypanosoma cruzi/imunologia , Anticorpos Antiprotozoários/sangue , Triatominae/parasitologia , Doença de Chagas/veterinária , Doenças do Cão/diagnóstico , Insetos Vetores/parasitologia , População Rural , Brasil/epidemiologia , Reação em Cadeia da Polimerase , Prevalência , Doença de Chagas/diagnóstico , Doença de Chagas/epidemiologia , Técnica Indireta de Fluorescência para Anticorpo , Doenças do Cão/epidemiologia
19.
Acta Trop ; 176: 364-372, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28887123

RESUMO

Rhodnius amazonicus Almeida et al. (1973) is a triatomine of rare occurrence. This species was found for the third time in Breves city, Pará state, Brazil. Morphometric and morphological studies were carried out on one male and one female. Lent and Wygodzinsky (1979) considered this species as a synonym of R. pictipes, until its revalidation after 23 years by Bérenger and Pluot-Sigwalt (2002). Considering the synonym mentioned above, a comparative study between these two species was performed in order to report the third encounter of this species, and increase the number of morphological characters that distinguish R. amazonicus from R. pictipes. The dorsal side of the head, the dorsal and ventral portions of the thorax, the dorsal, ventral and posterior sides of the female genitalia, eggs and the median process of the pygophore were examined by scanning electronic microscopy (SEM). The head, thorax, abdomen and egg parameters of these two species were also measured. The identification of characters on the head, stridulatory sulcus, mesosternum, metasternum, scutellum, process of urotergite I, external female genitalia, pygophore and eggs made the distinction between R. amazonicus and R. pictipes possible. This study has shown the new characters recorded and described for the first time for R. amazonicus and R. pictipes by SEM here made it possible to confirm the morphological separation between these two species. The morphometric analysis also confirmed that the above two taxa are different at specific level.


Assuntos
Abdome/anatomia & histologia , Genitália Feminina/anatomia & histologia , Cabeça/anatomia & histologia , Rhodnius/anatomia & histologia , Tórax/anatomia & histologia , Animais , Brasil , Feminino , Genitália Feminina/ultraestrutura , Masculino , Microscopia Eletrônica de Varredura , Óvulo/ultraestrutura , Rhodnius/ultraestrutura , Tórax/ultraestrutura
20.
Rev Soc Bras Med Trop ; 49(3): 351-6, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27384833

RESUMO

INTRODUCTION: Environmental modifications caused by human activities have led to changes in mosquito vector populations, and sylvatic species have adapted to breeding in urban areas. METHODS: Mosquitoes were collected using ovitraps in three sampling sites in the Atlantic Forest in the State of Rio de Janeiro, Brazil. RESULTS: We collected 2,162 Culicidae specimens. Haemagogus janthinomys and Haemagogus leucocelaenus, both sylvatic yellow fever virus vectors, were the most common species found. CONCLUSION: There is a potential for the transmission of arboviruses in and around these natural reserves. Therefore, it is necessary to maintain entomological surveillance programs in the region.


Assuntos
Biodiversidade , Culicidae/classificação , Mosquitos Vetores/classificação , Animais , Brasil , Florestas , Densidade Demográfica , Estações do Ano , Febre Amarela/transmissão
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...