scholarly journals Suscetibilidade de Rhipicephalus (Boophilus) microplus a carrapaticidas em Mato Grosso do Sul, Brasil

2011 ◽  
Vol 41 (8) ◽  
pp. 1447-1452 ◽  
Author(s):  
Alberto Gomes ◽  
Wilson Werner Koller ◽  
Antonio Thadeu Medeiros de Barros
Keyword(s):  
Bos Taurus ◽  
Boophilus Microplus ◽  
Mato Grosso ◽  
Mato Grosso Do Sul

O carrapato bovino, Rhipicephalus (Boophilus) microplus, destaca-se dentre os ectoparasitas de importância econômica à pecuária nacional, tornando-se necessária a adoção de medidas de controle, particularmente em rebanhos Bos taurus e seus cruzamentos. O controle do carrapato tem sido cada vez mais difícil devido à constatação de populações resistentes aos diversos produtos em uso. Neste estudo, teve-se por objetivo conhecer a suscetibilidade desse carrapato a acaricidas em Mato Grosso do Sul. De outubro de 2003 a outubro de 2006, testes carrapaticidogramas foram realizados em onze das principais regiões pecuárias do estado. Nos testes de suscetibilidade, foi utilizada a técnica de imersão de adultos, com posterior avaliação de parâmetros biológicos. Foram testados doze acaricidas comerciais, abrangendo sete princípios ativos (isoladamente ou em associação), pertencentes a três grupos químicos: amidinas (amitraz), piretróides sintéticos (cipermetrina) e organofosforados (clorfenvinfós, clorpirifós, diazinon, diclorvós e etion). Baixa suscetibilidade foi detectada em todas as propriedades, evidenciando uma reduzida eficácia de todos os grupos químicos testados. Apesar da grande variação de suscetibilidade demonstrada pelas distintas populações a cada acaricida testado, foi possível observar um gradiente de eficácia desses produtos. Independente da classe, a eficácia média dos produtos com um único princípio ativo (19,94%-64,27%) foi, de modo geral, menor que a das associações, tanto entre piretróide e organofosforados (46,38%-82,68%), como exclusivamente entre organofosforados (85,28%-97,68%). A associação contendo piretróide, organofosforados, sinergista e repelente (cipermetrina + clorpirifós + butóxido de piperonila + citronelal) apresentou 100% de eficácia, embora testada em menor número de populações. Embora comparações com cepas suscetíveis não tenham sido efetuadas, a baixa suscetibilidade demonstrada aos distintos produtos testados sugere que a resistência do carrapato a diferentes classes esteja amplamente disseminada no Estado, motivo pelo qual recomenda-se a realização rotineira de testes de suscetibilidade antes da seleção e aplicação de produtos acaricidas para controle do carrapato.

scholarly journals Evaluation of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) resistance to different acaricide formulations using samples from Brazilian properties

2016 ◽  
Vol 25 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Leandro de Oliveira Souza Higa ◽  
Marcos Valério Garcia ◽  
Jacqueline Cavalcante Barros ◽  
Wilson Werner Koller ◽  
Renato Andreotti
Keyword(s):  
Immersion Test ◽  
Minas Gerais ◽  
Boophilus Microplus ◽  
Economic Losses ◽  
Mato Grosso ◽  
Main Method ◽  
Espírito Santo ◽  
Distrito Federal ◽  
Espirito Santo ◽  
Mato Grosso Do Sul

Abstract The Rhipicephalus (Boophilus) microplus tick is responsible for considerable economic losses in Brazil, causing leather damage, weight loss and reduced milk production in cattle and results in the transmission of pathogens. Currently, the main method for controlling this tick is using acaricides, but their indiscriminate use is one of the major causes of resistance dissemination. In this study, the adult immersion test (AIT) was used to evaluate resistance in ticks from 28 properties located in five different states (Mato Grosso do Sul, Mato Grosso, Ceará, São Paulo, e Minas Gerais) and the Distrito Federal (DF) of Brazil. The resistance was found in 47.64% of the repetitions demonstrating an efficacy of less than 90% in various locations throughout the country. The larvae packet test was used to evaluate samples from ten properties in four states (Mato Grosso do Sul, Mato Grosso, Minas Gerais and Espírito Santo). Spray products belonging to the main classes of acaricides, including combination formulations, were used in both types of test. New cases of resistance were found on properties within the states of Ceará, Espírito Santo and Mato Grosso, where such resistance was not previously reported.

scholarly journals Current status of ticks and tick-host relationship in domestic and wild animals from Pantanal wetlands in the state of Mato Grosso do Sul, Brazil

2017 ◽  
Vol 107 (suppl) ◽  
Author(s):  
Paulo Henrique Duarte Cançado ◽  
João Luiz Horácio Faccini ◽  
Guilherme de Miranda Mourão ◽  
Eliane Mattos Piranda ◽  
Valéria Castilho Onofrio ◽  
...  
Keyword(s):  
Scientific Literature ◽  
Domestic Animals ◽  
Boophilus Microplus ◽  
Current Status ◽  
Good Representation ◽  
Hard Tick ◽  
Study Region ◽  
Mato Grosso ◽  
Mato Grosso Do Sul ◽  
Amblyomma Tigrinum

ABSTRACT This is a commented list of tick’s species collected on various wild and domestic animals, including the reports on scientific literature for the studied region. Most of animals were small or medium mammals. Carnivores were the main taxa group examined. Although, the pampas deer ( Ozotocerus bezoarticus) and giant anteater ( Mymercophaga tridactyla) also has a good representation on study. Among domestic animals, dogs, horses and cattle were examined. Summing up, 18 tick species were listed for the region. Sixteen were hard ticks (Ixodidae) and two soft ticks (Argasidae). Amblyomma sculptum was the most common and abundant hard tick. Ornithodoros rostratus (Argasidae) was very abundant, being the more important Argasidae tick on the study region. The following species were colleted or reported on scientific literature: Argas miniatus Koch, 1844; Ornithodoros rostratus Aragão, 1911; Dermacentor nitens Newmann, 1897; Rhipicephalus ( Boophilus) microplus Canestrini, 1887; Amblyomma tigrinum Koch, 1844; A. dissimile Koch, 1844; A. ovale Koch, 1844; A. pauvum Aragão, 1908; A. sculptum Berlese, 1888; A. calcaratum Neumann, 1899; A. coelebs Neumann, 1899; A. dubittatum Newmann, 1899; A. scalpturatum Newmann, 1906; A. naponense Packard, 1869; A. nodosum Newmann, 1899; A. pseudoconcolor Aragão, 1908; A. rotundatum Koch, 1844; A. triste Koch, 1844.

Sperm characteristics of Bos taurus taurus and Bos taurus indicus bulls during winter in Mato Grosso do Sul, Brazil

2018 ◽  
Vol 194 ◽  
pp. e9
Author(s):  
Ana Beatriz Marques de Almeida ◽  
Fábio Morotti ◽  
Anne Kemmer Souza ◽  
Maria Isabel Mello Martins
Keyword(s):  
Bos Taurus ◽  
Mato Grosso ◽  
Sperm Characteristics ◽  
Bos Taurus Indicus ◽  
Mato Grosso Do Sul

scholarly journals Epidemiological factors related to the transmission risk of Trypanosoma cruzi in a Quilombola community, State of Mato Grosso do Sul, Brazil

2011 ◽  
Vol 44 (5) ◽  
pp. 576-581 ◽  
Author(s):  
Marlon Cezar Cominetti ◽  
Renato Andreotti ◽  
Elisa Teruya Oshiro ◽  
Maria Elizabeth Moraes Cavalheiros Dorval
Keyword(s):  
Trypanosoma Cruzi ◽  
Bos Taurus ◽  
Rattus Rattus ◽  
Buffy Coat ◽  
Ovis Aries ◽  
Transmission Risk ◽  
Mato Grosso ◽  
Wild Mammals ◽  
Molecular Tests ◽  
Mato Grosso Do Sul

INTRODUCTION: This work was an epidemiological investigation of the risk of Trypanosoma cruzi transmission in the rural Quilombola community of Furnas do Dionízio, State of Mato Grosso do Sul, Brazil. METHODS: Of the 71 animals examined, seven were captured (two opossums, Didelphis albiventris; four rats, Rattus rattus; and one nine-banded armadillo, Dasypus novemcinctus) and 64 were domestic (one canine, Canis familiaris; five pigs, Sus scrofa; two bovines, Bos taurus; five caprines, Capra sp.; and 51 ovines, Ovis aries). Parasitological tests were performed to detect parasites in the blood and to identify the morphology of flagellates. These methods included fresh examinations, buffy coat tests and blood cultures. Molecular analysis of DNA for identification of trypanosomatids was performed by polymerase chain reaction (PCR) with primers S35 and S36. RESULTS: The parasitological tests showed flagellates in an opossum and two cattle. The molecular tests showed DNA from T. cruzi in an opossum and a pig. Triatoma sordida was the only triatomine species found in the community, and it colonized households (four specimens) and the surrounding areas (124 specimens). Twenty-three specimens tested positive for flagellates, which were subsequently identified as T. cruzi by PCR. CONCLUSIONS: Data analysis demonstrated that T. cruzi has a peridomestic life cycle that involves both domestic and wild mammals.

scholarly journals Characterization of the pyrethroid resistance profile of Rhipicephalus (Boophilus)microplus populations from the states of Rio Grande do Sul and Mato Grosso do Sul, Brazil

2013 ◽  
Vol 22 (3) ◽  
pp. 379-384 ◽  
Author(s):  
Márcia Cristina Mendes ◽  
Fernanda Calvo Duarte ◽  
João Ricardo Martins ◽  
Guilherme Marcondes Klafke ◽  
Leonardo Costa Fiorini ◽  
...  
Keyword(s):  
Pyrethroid Resistance ◽  
Rio Grande ◽  
Boophilus Microplus ◽  
Cattle Tick ◽  
Synthetic Pyrethroids ◽  
Rio Grande Do Sul ◽  
Mato Grosso ◽  
Cattle Ticks ◽  
Mato Grosso Do Sul

Cattle ticks Rhipicephalus(Boophilus) microplus are mainly controlled in Brazil by means of acaricide products, without any official policies in this regard. Acaricides continue to be sold indiscriminately, and this has contributed towards making the problem of resistance widespread, thus making diagnosis and monitoring of tick resistance essential. Here, bioassays (larval packet test) were performed on tick populations from the states of Rio Grande do Sul and Mato Grosso do Sul regarding their susceptibility to cypermethrin, deltamethrin and flumethrin. All the tick samples tested showed resistance to cypermethrin (10) (resistance factor (RF) ranging from 5.6 to 80.3) and deltamethrin (10) (RF ranging from 2.4 to 83.1). Six out of eight populations were resistant to flumethrin (RF ranging from 3.8 to 8.2). PCR molecular analyses did not show any T2134A mutations in the voltage-gated sodium channel gene, in any of the sampled populations. The results from this study highlight the critical status of resistance of the cattle tick to synthetic pyrethroids in the regions studied. Further studies are needed to identify the mechanisms responsible for the resistant phenotypes observed in the bioassays. This was the first detection of flumethrin resistance in Brazil.

scholarly journals Efficacy of extracts from plants of the Brazilian Pantanal against Rhipicephalus (Boophilus)microplus

2013 ◽  
Vol 22 (4) ◽  
pp. 532-538 ◽  
Author(s):  
Larissa Bezerra dos Santos ◽  
Juliana Kátia Souza ◽  
Barbara Papassoni ◽  
Dyego Gonçalves Lino Borges ◽  
Geraldo Alves Damasceno Junior ◽  
...  
Keyword(s):  
Immersion Test ◽  
Acaricidal Activity ◽  
Boophilus Microplus ◽  
Stage I ◽  
Fruit Extract ◽  
Mato Grosso ◽  
Sesbania Virgata ◽  
Brazilian Pantanal ◽  
Mato Grosso Do Sul

This research evaluated the in vitro acaricidal activity of extracts from 21 plant species from the Pantanal of Mato Grosso do Sul. During stage I, a larval immersion test was performed using three extract concentrations (5%, 20%, and 40%). During stage II, we used only plants that showed over 95% efficiency at the 40% concentration in stage I in an amount sufficient for the adult immersion test. Aeschynomene denticulata, Angelonia hirta, Aspilia latissima, Caperonia castaneifolia, Centratherum punctatum, Crotalaria micans, Diodia kuntzei, Echinodorus paniculatus, Hyptis mutabilis, Lantana canescens, Melanthera latifolia, Ocotea diospyrifolia, Richardia grandiflora, Sebastiana hispida, Tocoyena formosa, Zanthoxylum rigidum, and Sesbania virgata (fruit extract) showed acaricidal activity against the larval stage ofRhipicephalus (Boophilus)microplus higher than 95% at a 40% (w/v) concentration, while Hippocratea volubilis and Randia armatashowed moderate efficacy and Croton glandulosus andSenna obtusifolia had no effect. The M. latifolia, A. hirta, R. grandiflora, and A. latissima raw extracts were evaluated for their activity against adults, and only A. hirta showed an efficacy close to 90%. Eighteen extracts had an efficacy of up to 95% against larvae at a 40% concentration, seven extracts were effective at 20%, and only one (Sebastiana hispida) was effective at a 5% concentration.

scholarly journals Pesquisa de anticorpos contra Leptospira spp. em animais silvestres e em estado feral da região de Nhecolândia, Mato Grosso do Sul, Brasil: utilização da técnica de imuno-histoquímica para detecção do agente

2004 ◽  
Vol 34 (1) ◽  
pp. 165-169 ◽  
Author(s):  
Raul José Silva Girio ◽  
Fernando Lúcio Garcia Pereira ◽  
Moacir Marchiori Filho ◽  
Luís Antônio Mathias ◽  
Rita de Cássia Pereira Herreira ◽  
...  
Keyword(s):  
Bos Taurus ◽  
Bubalus Bubalis ◽  
Ovis Aries ◽  
Mato Grosso ◽  
Nasua Nasua ◽  
Ozotoceros Bezoarticus ◽  
Bos Taurus Indicus ◽  
Em 12 ◽  
Mato Grosso Do Sul ◽  
Mazama Americana

Foram examinadas 315 amostras de soros sangüíneos de diversas espécies de animais que vivem em estado feral ou silvestre na região de Nhecolândia, Corumbá, MS, por meio da prova de soroaglutinação microscópica para leptospirose. Dessas amostras, 67 foram de bois baguás (Bos taurus indicus), 39 de porcos-monteiros (Sus scrofa), 39 de búfalos (Bubalus bubalis), nove de quatis (Nasua nasua), 41 de veados-campeiros (Ozotoceros bezoarticus), 10 de veados-mateiros (Mazama americana) e 110 amostras de ovinos (Ovis aries). Em 12 animais que vieram a óbito, seis porcos-monteiros, quatro veados-campeiros e dois ovinos, foram realizadas tentativas de isolamento de Leptospira do fígado e dos rins por cultura em meio semi-sólido. Fragmentos desses órgãos foram submetidos a exame histopatológico e também a exame para detecção das Leptospiras pela técnica de imuno-histoquímica. Os resultados dos exames sorológicos mostraram que 64 (20,3%) das amostras foram reagentes para, pelo menos, um sorovar de Leptospira patogênica; foram reagentes 41,0% das amostras de búfalos, 40,3% das de bois baguás, 17,9% das de porcos-monteiros, 9% das de ovinos e 9,7% das amostras de veados-campeiros; nenhuma das amostras de veados-mateiros e de quatis foi reagente. Os sorovares mais freqüentes foram: pomona, para búfalos e ovinos; icterohaemorrhagiae, para ovinos, veados-campeiros e suínos; e copenhageni, para veados-campeiros e suínos. As tentativas de isolamento dos rins e fígados foram todas negativas, e pela técnica da imuno-histoquímica foi detectada Leptospira no fígado de um porco-monteiro. As principais alterações estruturais, encontradas nos rins de dois veados-campeiros e de um porco-monteiro, foram infiltrado inflamatório intersticial com congestão associada a hemorragias.

scholarly journals Acaricide resistance of Rhipicephalus (Boophilus) microplus in State of Mato Grosso do Sul, Brazil

2011 ◽  
Vol 20 (2) ◽  
pp. 127-133 ◽  
Author(s):  
Renato Andreotti ◽  
Felix David Guerrero ◽  
Mariana Aparecida Soares ◽  
Jacqueline Cavalcante Barros ◽  
Robert John Miller ◽  
...  
Keyword(s):  
Gene Mutation ◽  
Pyrethroid Resistance ◽  
Immersion Test ◽  
The State ◽  
Boophilus Microplus ◽  
Acaricide Resistance ◽  
Mato Grosso ◽  
Pcr Assays ◽  
Mato Grosso Do Sul

This study was conducted to obtain an epidemiological view of acaricide resistance in populations of Rhipicephalus (Boophilus) microplus in the State of Mato Grosso do Sul. Twenty-four tick samples were collected from municipalities in the State where farmers had reported concerns about resistance to or failure of tick control. These ticks were subjected to in vitro resistance detection assays using the adult immersion test (AIT). The efficacy of alpha-cypermethrin, cypermethrin and amitraz treatments on samples collected throughout the State was generally poor. AIT showed efficacy > 90% from the use of DDVP + chlorfenvinphos) (20 out of 21 municipalities), dichlorvos + cypermethrin (10 out of 16 municipalities) and cypermethrin + citronella + chlorpyrifos + piperonyl butoxide (20 out of 21 municipalities). PCR assays were used to detect the presence of pyrethroid resistance-associated sodium channel gene mutation. Larvae from three different populations that had previously been diagnosed as pyrethroid-resistant, through AIT, were evaluated. The PCR assays showed that the pyrethroid resistance-associated gene mutation was absent from these three populations. This study confirms that the emergence of resistance is a constant challenge for the livestock industry, and that development of resistance continues to be a major driver for new antiparasitic drugs to be developed.

scholarly journals Molecular identification of Ehrlichia sp. in a beef cattle from brazilian Cerrado - case report

2019 ◽  
Vol 71 (6) ◽  
pp. 1940-1943
Author(s):  
G. Oliveira ◽  
A.W. Silveira ◽  
S. Sorgatto ◽  
M.A. Araújo ◽  
T.R. Antunes ◽  
...  
Keyword(s):  
Natural Infection ◽  
Clinical Signs ◽  
Boophilus Microplus ◽  
Molecular Evidence ◽  
Evidence Based ◽  
Brazilian Cerrado ◽  
Babesia Bigemina ◽  
Pathogenic Potential ◽  
Mato Grosso ◽  
Mato Grosso Do Sul

ABSTRACT Ehrlichia infections in cattle are frequent in Africa but have also been reported in Brazil and North America. This paper reports natural infection by Ehrlichia sp. associated with Babesia bigemina and Anaplasma marginale in a calf in the municipality of Campo Grande, state of Mato Grosso do Sul, Brazil, presenting polioencephalomalacia. The molecular evidence, based on a fragment of the dsb gene, indicates a species of Ehrlichia genetically related to Ehrlichia canis and other species of the genus found in the tick Rhipicephalus (Boophilus) microplus and a calf from Brazil (99 to 100% identity). It was not possible to associate the clinical signs with Ehrlichia infection due to co-infections and histological evidence of another disease. However, the circulation of the bacteria in bovines in Brazilian Cerrado was confirmed and more attention should be given to clinical suspicion of tick-borne pathogens in cattle to clarify the pathogenic potential of Ehrlichia sp.

scholarly journals Environmentally associated ticks (Acari: Ixodidae) in Campo Grande, Mato Grosso do Sul, Brazil

2013 ◽  
Vol 22 (1) ◽  
pp. 124-128 ◽  
Author(s):  
Marcos Valério Garcia ◽  
Dayana Campelo da Silva ◽  
Robson Ferreira Cavalcante de Almeida ◽  
Rodrigo Casquero Cunha ◽  
Jaqueline Matias ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Tick Species ◽  
Sampling Period ◽  
Domestic Animals ◽  
Boophilus Microplus ◽  
Capuchin Monkeys ◽  
Mato Grosso ◽  
Research Company ◽  
One Year ◽  
Mato Grosso Do Sul

Herein, we report tick species found on wild and domestic animals and in the environment during a one-year sampling period at the Brazilian Farming Research Company beef cattle unit (Embrapa Beef Cattle), which is located within the urban area of Campo Grande, Mato Grosso do Sul, Brazil. From 55 wild hosts including six different species (Nasua nasua, Cebus spp., Cerdocyon thous,Myrmecophaga tridactyla, Tamandua tetradactyla and Dasyprocta aguti), 323 ticks were collected. Amblyomma ovale ticks were found solely on coatis, and Amblyomma nodosum was identified solely on anteaters. No ticks were found on capuchin monkeys. However, Amblyomma cajennense was found on all parasitized host species with the exception of capuchin monkeys. Giant anteaters displayed the highest infestation abundance, with a mean of 53 ticks∕animal. Environmental sampling yielded 166 adult A. cajennense ticks. The tick species found on domestic animals (Rhipicephalus(Boophilus) microplus,R. sanguineus, Dermacentor nitens andA. cajennense) were those typically found on these hosts in Brazil. The most prevalent tick species, A. cajennense, was found on both wild and domestic animals and was also prevalent in the environment. Thus, this tick species is the primary vector that allows pathogens to bridge wild and domestic animals in the Cerrado.

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