ABSTRACT
Abstract The aim of this study was to investigate the level of exposure to Leishmania infection in stray dogs in an area of intense visceral leishmaniasis transmission in the state of Pernambuco, Brazil. Blood samples from 178 dogs were analyzed using serological and molecular assays: rapid immunochromatographic test (ICT), enzyme-linked immunosorbent assay (ELISA), immunofluorescence antibody test (IFAT), and conventional and quantitative polymerase chain reaction (cPCR and qPCR). Positivity values obtained with serological tests were 71.4% (127/178), 70.2% (125/178), and 50.6% (90/178) using ICT, ELISA, and IFAT, respectively, with 38.8% (69/178) of the dogs were simultaneously positive for all three tests. The positivity values obtained with cPCR and qPCR were 20.2% (36/178) and 38.8% (69/178), respectively, with 11.8% (21/178) testing positive in both molecular assays. Overall, 87.1% (155/178) were positive for anti-Leishmania spp. antibodies and/or Leishmania spp. DNA. Positivity to one or more tests was statistically associated with lymphadenomegaly, skin lesions, lymphocytosis, anemia and hyperproteinemia. The results of this study revealed a high level of exposure to Leishmania in stray dogs in an area of intense human visceral leishmaniasis transmission, suggesting that dogs play a role as reservoirs in the transmission cycle of this zoonosis.
Resumo O objetivo deste estudo foi investigar o nível de exposição à infecção por Leishmania em cães errantes de uma área de transmissão intensa de leishmaniose visceral no estado de Pernambuco. Amostras de sangue de 178 cães foram avaliadas por testes sorológicos e moleculares: teste imunocromatográfico (IC), ensaio imunoenzimático (ELISA), teste de imunofluorescência de anticorpos (RIFI), reação em cadeia da polimerase convencional e quantitativa (cPCR e qPCR). Os valores de positividade obtidos com os testes sorológicos foram 71,4% (127/178), 70,2% (125/178) e 50,6% (90/178) com IC, ELISA e RIFI, respectivamente. E com 38,8% (69/178) dos cães mostraram-se simultaneamente positivos aos três testes. Os valores de positividade obtidos por cPCR e qPCR foram 20,2% (36/178) e 38,8% (69/178), respectivamente. E com 11,8% (21/178) dos cães foram positivos em ambos os testes moleculares. No geral, 87,1% (155/178) foram positivos para anticorpos anti-Leishmania spp. e/ou material genético de Leishmania spp. A positividade a um ou mais testes foi estatisticamente associada à linfonodomegalia, lesões cutâneas, linfocitose, anemia e hiperproteinemia. Os resultados do estudo revelam um alto nível de exposição à Leishmania spp. em cães errantes em uma área de transmissão intensa de leishmaniose visceral humana, sugerindo que eles podem desempenhar um papel como reservatórios no ciclo de transmissão dessa zoonose.
Subject(s)
Humans , Animals , Dogs , Leishmaniasis/veterinary , Leishmania infantum/genetics , Dog Diseases/diagnosis , Dog Diseases/epidemiology , Leishmania/genetics , Leishmaniasis, Visceral/diagnosis , Brazil/epidemiology , Enzyme-Linked Immunosorbent Assay/veterinary , Leishmaniasis, Visceral/veterinary , Leishmaniasis, Visceral/epidemiologyABSTRACT
Abstract Equine piroplasmosis, an economically important disease in horses, has so far not been reported in Pernambuco state, Brazil. This study aimed to evaluate the seroprevalence of anti-Babesia caballi and anti-Theileria equi antibodies based on the detection of these agents in equine blood and in ticks on horses in the municipality of Petrolina, Pernambuco, northeastern Brazil. Blood samples were drawn from 393 horses and sera were examined by ELISA. The presence of tick infestations was evaluated, and 101 ticks were subjected to DNA amplification for the detection of Babesia spp. by polymerase chain reaction (PCR). No parasites were detected in the blood smears. Anti-B. caballi and anti-T. equi antibodies were found in 27.2% (107/393) and 34.8% (137/393) horses, respectively. Infestation by Dermacentor nitens was detected in 4.3% (17/393) of the horses. There was no DNA amplification of the agents in ticks. The risk factors for the presence of anti-T. equi antibodies (P < 0.05) were: purebred (P < 0.001), animals older than 156 months (P = 0.014), and the presence of ticks (P = 0.001). No risk factors for B. caballi were identified. This study confirmed the circulation of agents of equine piroplasmosis in the municipality of Petrolina, state of Pernambuco, Brazil.
Resumo Piroplasmose equina é uma doença economicamente importante em equinos e não possui relatos no Estado de Pernambuco, Brasil. O objetivo deste estudo foi avaliar a soroprevalência de anticorpos anti-B. caballi e anti-T. equi pela detecção destes agentes no sangue e carrapatos de equinos no município de Petrolina, Pernambuco, Nordeste do Brasil. Amostras de sangue de 393 equinos foram coletadas e submetidas ao esfregaço sanguíneo e ELISA. A presença de infestação por carrapatos foi avaliada, e 71 carrapatos foram submetidos à Reação em Cadeia da Polimerase (PCR) para Babesia spp. Nenhum parasito foi detectado na análise de esfregaços de sangue. Anticorpos anti-B. caballi e anti-T. equi foram verificados em 27,2% (107/393) e 34,8% (137/393) dos equinos, respectivamente. A infestação por Dermacentor nitens foi verificada em 4,3% (17/393) dos equinos. Não houve amplificação do DNA dos agentes nos 71 carrapatos submetidos à PCR. Os fatores de risco para presença de anticorpos anti-T. equi (P < 0,05) foram: raça definida (P < 0,001), animais > de 156 meses (P = 0,014) e presença de carrapatos (P = 0,001). Nenhum fator de risco foi identificado para B. caballi. Esse estudo permitiu a confirmação da presença de agentes da piroplasmose equina no município de Petrolina, Pernambuco.
Subject(s)
Animals , Male , Female , Babesiosis/epidemiology , Ticks/microbiology , Horse Diseases/epidemiology , Phylogeny , Babesia/genetics , Babesia/immunology , Babesiosis/diagnosis , Brazil/epidemiology , Enzyme-Linked Immunosorbent Assay/veterinary , Seroepidemiologic Studies , Polymerase Chain Reaction/veterinary , Prevalence , Risk Factors , DNA, Protozoan/blood , Horse Diseases/diagnosis , Horse Diseases/parasitology , HorsesABSTRACT
Abstract INTRODUCTION The National Park of Serra das Confusões (NPSC) is a protected area of natural landscape located in Southern Piauí, Brazil, and it is considered as one of the largest and most important protected areas in the Caatinga biome. METHODS The natural occurrences of trypanosomatids from hemocultures on small mammals and cultures from intestinal contents triatomines were detected through molecular diagnoses of blood samples, and phylogenetic relationship analysis of the isolates parasites using the trypanosome barcode (V7V8 SSUrDNA) were realized. RESULTS Only two Galea spixii (8.1%) and six Triatoma brasiliensis (17.6%) were positive by hemoculture, and the isolates parasites were cryopreserved. All the isolates obtained were positioned on the Trypanosoma cruzi DTU TcI branch. CONCLUSIONS Research focused on studying the wild animal fauna in preserved and underexplored environments has made it possible to elucidate indispensable components of different epidemiological chains of diseases with zoonotic potential.
Subject(s)
Animals , Rodentia/parasitology , Trypanosoma cruzi/genetics , Disease Reservoirs/parasitology , Triatominae/parasitology , Animals, Wild/parasitology , Marsupialia/parasitology , Phylogeny , Rodentia/classification , Trypanosoma cruzi/isolation & purification , Brazil , Biodiversity , Parks, Recreational , Genotype , Marsupialia/classificationABSTRACT
ABSTRACT This study verified the occurrence of Bartonella spp. in dogs, cats, wild mammals and their ectoparasites in Petrolina and Lagoa Grande Counties, Pernambuco, located in a semi-arid region in Northeastern Brazil. Anti-Bartonella spp. antibodies were detected by indirect immunofluorescence assay (IFA) in 24.8% of dogs (27/109) and in 15% of cats (6/40). Bartonella sp. DNA was identified by PCR performed on DNA extracted from blood and ectoparasites using primers targeting Bartonella sp. gltA and ribC genes in 100% (9/9) of Pulex irritans from Cerdocyon thous, 57.4% (35/61) of P. irritans from dogs, 2.3% (1/43) of Ctenocephalides felis felis from dogs, 53.3% (24/45) of C. felis felis from cats, and 10% (1/10) of Polyplax spp. from Thrichomys apereoides. DNA sequencing identified Bartonella clarridgeiae and Bartonella henselae in C. felis felis from cats, Bartonella rochalimae in P. irritans from dog and C. thous, and Bartonella vinsoni berkhofii in P. irritans from dog.
Subject(s)
Animals , Cats , Dogs , Lice Infestations/veterinary , Tick Infestations/veterinary , Bartonella/isolation & purification , Bartonella Infections/veterinary , Flea Infestations/veterinary , Rodentia/microbiology , Rodentia/parasitology , Bartonella/genetics , Bartonella Infections/epidemiology , Brazil , DNA, Bacterial/genetics , Polymerase Chain Reaction , Fluorescent Antibody Technique, Indirect , Canidae/microbiology , Canidae/parasitology , Animals, Wild/microbiology , Animals, Wild/parasitology , Marsupialia/microbiology , Marsupialia/parasitologyABSTRACT
ABSTRACT: This experiment was carried out to study the bioacaricidal activity of Amburana cearensis against engorged females of Rhipicephalus (Boophilus) microplus. The crude ethanolic extract from the leaves of A. cearensis was submitted to partition with organic solvents (hexane, chloroform and ethyl acetate) in order of increasing polarity; and evaluated using three treatments at concentrations of 5, 10 and 25mg ml-1. To evaluate the acaricidal activity, engorged females were submitted to the adult immersion test. Parameters analyzed were the weight of females; weight of egg mass; percentage of hatch; reproductive efficiency; expected rate of reproduction; and efficacy. For each extract and concentrating fraction, tests were performed in triplicate. Among all fractions, the hexane (2.5%) achieved the best results in all parameters analyzed: 52.7% of inhibition of oviposition; 39% of hatching rate; 3,271 index of reproductive efficiency; and 67.0% effectiveness. The extract obtained gradual dose response with increasing concentration; and could be used as an aid in the control of R. (B.) microplus therapy.
RESUMO: O objetivo deste estudo foi avaliar a atividade acaricida in vitro de Amburana cearensis contra fêmeas ingurgitadas de Rhipicephalus (Boophilus) microplus. O extrato etanólico bruto das folhas de A. cearensis foi submetido à partição com solventes orgânicos (hexano, clorofórmio e acetato de etila) em ordem crescente de polaridade. Foram realizadas três diluições, nas concentrações de 5, 10 e 25mg ml-1. Para avaliar a atividade carrapaticida, fêmeas teleóginas foram submetidas ao teste de imersão de fêmeas ingurgitadas. Os parâmetros analisados foram peso das fêmeas, peso da massa de ovos, porcentagem de eclosão, eficiência reprodutiva, índice de reprodução esperada e eficácia. Para cada extrato, fração e concentração, os testes foram realizados em triplicata. Dentre as frações, a hexânica (2,5%) apresentou os melhores resultados para todos os parâmetros analisados, alcançando 52,7% de inibição da oviposição; 39,0% de porcentagem de eclosão; 3.271 de índice de eficiência reprodutiva; e 67% de eficácia. O extrato obteve uma dose resposta gradual com o aumento da concentração; podendo ser utilizado como terapia auxiliar no controle do R. (B.) microplus.