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Suniga PAP, Mantovani C, dos Santos MG, do Egito AA, Verbisck NV, dos Santos LR, Dávila AMR, Zimpel CK, Zerpa MCS, Chiebao DP, de Sá Guimarães AM, de Castro Nassar AF, de Araújo FR. Glanders Diagnosis in an Asymptomatic Mare from Brazil: Insights from Serology, Microbiological Culture, Mass Spectrometry, and Genome Sequencing. Pathogens 2023; 12:1250. [PMID: 37887766 PMCID: PMC10609850 DOI: 10.3390/pathogens12101250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 09/21/2023] [Accepted: 10/06/2023] [Indexed: 10/28/2023] Open
Abstract
This manuscript elucidates the occurrence of glanders in an asymptomatic mare from Brazil presenting positive Burkholderia mallei antibody titers. The diagnosis was established through a multi-pronged approach encompassing microbiological culture, mass spectrometry, and genome sequencing. The outbreak occurred in 2019 in Tatuí, São Paulo, Brazil, and the infected mare, despite displaying no clinical symptoms, had multiple miliary lesions in the liver, as well as intense catarrhal discharge in the trachea. Samples were collected from various organs and subjected to bacterial isolation, molecular detection, and identification. The strain was identified as B. mallei using PCR and confirmed by MALDI-TOF mass spectrometry. Whole-genome sequencing revealed a genome size of 5.51 Mb with a GC content of 65.8%, 5871 genes (including 4 rRNA and 53 tRNA genes), and 5583 coding DNA sequences (CDSs). Additionally, 227 predicted pseudogenes were detected. In silico analysis of different genomic loci that allow for differentiation with Burkholderia pseudomallei confirmed the identity of the isolate as B. mallei, in addition to the characteristic genome size. The BAC 86/19 strain was identified as lineage 3, sublineage 2, which includes other strains from Brazil, India, and Iran. The genome sequencing of this strain provides valuable information that can be used to better understand the pathogen and its epidemiology, as well as to develop diagnostic tools for glanders.
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Affiliation(s)
- Paula Adas Pereira Suniga
- Postgraduate Program in Animal Science, Faculty of Veterinary Medicine and Animal Science-FAMEZ/UFMS, Federal University of Mato Grosso Do Sul, Av. Senador Filinto Muller, 2443, Campo Grande 79074-460, MS, Brazil; (P.A.P.S.); (A.A.d.E.)
- MAI/DAI Scholarship, Federal University of Mato Grosso Do Sul, Cidade Universitária, Av. Costa E Silva, Campo Grande 79070-900, MS, Brazil
| | - Cynthia Mantovani
- Embrapa Beef Cattle/Ministry of Agriculture and Livestock Scholarship, Embrapa Beef Cattle, Av. Rádio Maia, 830, Campo Grande 79106-550, MS, Brazil;
| | | | - Andréa Alves do Egito
- Postgraduate Program in Animal Science, Faculty of Veterinary Medicine and Animal Science-FAMEZ/UFMS, Federal University of Mato Grosso Do Sul, Av. Senador Filinto Muller, 2443, Campo Grande 79074-460, MS, Brazil; (P.A.P.S.); (A.A.d.E.)
- Embrapa Beef Cattle, Campo Grande 79106-550, MS, Brazil; (M.G.d.S.); (N.V.V.); (F.R.d.A.)
| | | | | | - Alberto Martín Rivera Dávila
- Computational and Systems Biology Laboratory, Graduate Program in Biodiversity and Health, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro 21040-900, RJ, Brazil;
| | - Cristina Kraemer Zimpel
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA;
| | - Maria Carolina Sisco Zerpa
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, SP, Brazil; (M.C.S.Z.); (A.M.d.S.G.)
| | - Daniela Pontes Chiebao
- Animal Health Research Center, Biological Institute, Av. Conselheiro Rodrigues Alves, 1252, São Paulo 04014-002, SP, Brazil; (D.P.C.); (A.F.d.C.N.)
| | - Ana Márcia de Sá Guimarães
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo 05508-000, SP, Brazil; (M.C.S.Z.); (A.M.d.S.G.)
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Acosta ICL, Gennari SM, Grisi Filho JHH, Chiebao DP. From weaning to breeding age: Presence of antibodies to Toxoplasma gondii in sheep in the state of Espírito Santo, southeastern Brazil. Vet Parasitol Reg Stud Reports 2021; 24:100531. [PMID: 34024361 DOI: 10.1016/j.vprsr.2021.100531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 11/02/2020] [Accepted: 12/31/2020] [Indexed: 10/22/2022]
Abstract
Sheep are intermediate hosts of the protozoon Toxoplasma gondii, a zoonotic parasite that that may cause abortion and reproductive losses in this species. Previous studies have shown that its prevalence is high in sheep herds in Brazil, but no information from the state of Espírito Santo was available. The aim of this study was to improve the epidemiological data in different regions of this state by analyzing occurrences of anti-T. gondii antibodies in young female sheep, before reproductive age, using IFAT (cutoff ≥64). In addition, variables relating to these animals and farm management were investigated for significance of associations. A total of 312 sheep, aged 3 to 12 months, on five farms in five municipalities, were sampled. Among these 312 animals, 135 (43.26%) were reactive, and 70 positive sheep (51.8%) presented high titers (more than three times the cutoff).Eight-month-old sheep presented the lowest occurrence and 7 and 11-month-old sheep, the highest. At least one animal was positive in each municipality, thus confirming the endemic status of toxoplasmosis in sheep in this region. None of the variables analyzed, relating to animals and herds, presented any association with T. gondii occurrence (p > 0.05). The number of females that were close to sexual maturity (12 months) and which were reactive to T. gondii was less than 50%. These ewes would probably be more susceptible to reproductive problems.
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Affiliation(s)
- Igor Cunha Lima Acosta
- Dept. of Preventive Veterinary Medicine and Animal Science, Faculty of Veterinary Medicine, University of São Paulo, SP, Av. Prof. Orlando Marques de Paiva, 87, Cidade Universitária, São Paulo, SP CEP 05508-270, Brazil; Programa de Monitoramento da Biodiversidade Aquática na Área Ambiental I Rede Rio Doce Mar/Projeto Albatroz, Instituto Albatroz, Santos, SP, Brazil.
| | - Solange Maria Gennari
- Dept. of Preventive Veterinary Medicine and Animal Science, Faculty of Veterinary Medicine, University of São Paulo, SP, Av. Prof. Orlando Marques de Paiva, 87, Cidade Universitária, São Paulo, SP CEP 05508-270, Brazil; Program of Post-Graduation in Veterinary Medicine, University of Santo Amaro, SP, Rua Prof. Eneas Siqueira Neto, 340, São Paulo, SP CEP 04829-900, Brazil
| | - José Henrrique Hildebrand Grisi Filho
- Dept. of Preventive Veterinary Medicine and Animal Science, Faculty of Veterinary Medicine, University of São Paulo, SP, Av. Prof. Orlando Marques de Paiva, 87, Cidade Universitária, São Paulo, SP CEP 05508-270, Brazil
| | - Daniela Pontes Chiebao
- Research Center for Animal Health, Biological Institute, Av. Conselheiro Rodrigues Alves, 1252, São Paulo, SP CEP 04014-900, Brazil
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Sevá ADP, Chiebao DP, Brandão APD, Godoy SN, Jimenez-Villegas T, Pena HFJ, Ferreira F. Seroprevalence and incidence of Toxoplasma gondii and Neospora caninum infection in naturally exposed domestic dogs from a rural area of São Paulo state, Brazil. ACTA ACUST UNITED AC 2020; 29:e008820. [PMID: 33027425 DOI: 10.1590/s1984-29612020053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 06/02/2020] [Indexed: 11/21/2022]
Abstract
Dogs are hosts of the protozoans Toxoplasma gondii, which causes an important public health disease, and Neospora caninum. Studies that have evaluated toxoplasmosis and neosporosis for prolonged periods in dog populations are rare. We analyzed infection by both parasites in a domestic dog population over three consecutive years in São Paulo state, Brazil. In the 1st, 2nd and 3rd years of collection, 181, 193 and 172 domiciles were visited, and blood samples of 331, 371 and 348 dogs were collected for antibody serology, respectively. The seroprevalence of T. gondii in each year was 27.2%, 22.5% and 43.9%, respectively, and that of N. caninum was 7.8%, 4.8% and 6.8%, respectively. The incidence rates for T. gondii in the 2nd and 3rd collections were 13.2% and 30.0%, and those for N. caninum were 3.3% and 4.4%, respectively. Positive and negative serological conversions for both agents occurred at high frequencies during the study period. This study reveals the canine population's serological profile and demonstrates the constant exposure of dogs to the investigated pathogens, indicating the need for prevention and control measures in the region.
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Affiliation(s)
- Anaiá da Paixão Sevá
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Universidade de São Paulo - USP, São Paulo, SP, Brasil.,Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz - UESC, Ilhéus, BA, Brasil
| | - Daniela Pontes Chiebao
- Centro de Pesquisa de Sanidade Animal, Instituto Biológico de São Paulo, São Paulo, SP, Brasil
| | - Ana Perola Drulla Brandão
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Silvia Neri Godoy
- Instituto Chico Mendes de Conservação da Biodiversidade, São Sebastião, SP, Brasil
| | - Tatiana Jimenez-Villegas
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Hilda Fátima Jesus Pena
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Fernando Ferreira
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Universidade de São Paulo - USP, São Paulo, SP, Brasil
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Chiebao DP, Martins CM, Pena HFDJ, Gabriel FHDL, Turazza J, Soares H, Merlo A. Epidemiological study of Giardia duodenalis infection in companion dogs from the metropolitan area of São Paulo Brazil. Zoonoses Public Health 2020; 67:765-773. [PMID: 32347663 DOI: 10.1111/zph.12710] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 02/13/2020] [Accepted: 03/30/2020] [Indexed: 11/28/2022]
Abstract
Giardia duodenalis is a zoonotic pathogen associated with gastrointestinal disease that has a direct life cycle, with cysts eliminated in the faeces of an infected host being ingested by a susceptible host. In Brazil, studies of chronically infected adult dogs estimated a prevalence of 10%-20%. Diagnosis of giardiasis, as a cause of diarrhoea is important for the global One-Health guidelines when controlling cyst dissemination in the environment. We investigated the prevalence of G. duodenalis in the pet dog population of the metropolitan area of Sao Paulo, compared the efficacy of direct tests available to the veterinary clinical practice and attempted to identify possible risk factors associated with the parasite. Ten veterinary practices distributed throughout the municipality randomly performed the rapid SNAP ELISA test on canine faecal samples, and dog owners provided information specific to the animal via a questionnaire. The samples were also analysed using sucrose and zinc sulphate flotation techniques. Sensitivity and specificity of the tests were used to calculate required number of samples and true prevalence. Significance, agreement among tests, and odds ratio (OR) were assessed with a confidence interval (CI) of 95%. The prevalence of G. duodenalis in dogs (n = 265) was 6.9% (CI 3.47-11.21). Positive tests were significantly more frequent in animals younger than 1 year, with an OR for G. duodenalis occurrence nearly 7-fold that of older dogs. Direct diagnosis tests showed high agreement (96.1%, κ = 0.729; p < .0001) showing that the combined techniques provide a highly accurate diagnosis. Results indicated that the control of the pathogen has been improving in the pet dog population in metropolitan Sao Paulo, but management tools including diagnosis, immunization, and treatment, especially in puppies, must be continued in order to advance towards continuous decrease of the disease.
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Affiliation(s)
- Daniela Pontes Chiebao
- Regional Laboratory of Sorocaba, Center for Research in Animal Health, Agência Paulista de Tecnologia dos Agronegócios - APTA, Sorocaba, Brasil
| | - Camila Marinelli Martins
- Departament of Nursing and Public Health, Universidade Estadual de Ponta Grossa, Ponta Grossa, Brasil.,AAC&T Research Consulting LTDA, Ponta Grossa, Brasil
| | - Hilda Fatima de Jesus Pena
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science - FMVZ, University of Sao Paulo, São Paulo, Brasil
| | - Fábio Henrique de Lima Gabriel
- Regional Laboratory of Sorocaba, Center for Research in Animal Health, Agência Paulista de Tecnologia dos Agronegócios - APTA, Sorocaba, Brasil
| | | | - Herbert Soares
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science - FMVZ, University of Sao Paulo, São Paulo, Brasil
| | - Alexandre Merlo
- Zoetis Indústria de Produtos Veterinários Ltda., São Paulo, Brasil
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Chiebao DP, Pena HF, Passarelli D, Santín T, Pulz LH, Strefezzi RF, Sevá AP, Martins CM, Lopes EG, Grisi Filho JHH, Gennari SM, Soares RM. Congenital Transmission of Toxoplasma gondii After Experimental Reinfection With Brazilian Typical Strains in Chronically Infected Sheep. Front Vet Sci 2019; 6:93. [PMID: 31001545 PMCID: PMC6454189 DOI: 10.3389/fvets.2019.00093] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 03/06/2019] [Indexed: 11/13/2022] Open
Abstract
Toxoplasma gondii is a cause of congenital diseases, miscarriages and stillbirths in production animals. In Brazil, non-archetypal genotypes of the parasite may be related to severe disease. Experimental infection with T. gondii was studied in sheep to analyse congenital transmission-related parameters in reinfections with different Brazilian parasite strains. Thirteen T. gondii-seronegative sheep were orally infected with 2 × 103oocysts for the primary infection: G1 (4 animals) were inoculated with TgCatBr71 strain (Type BrI genotype) and G2 andG3 (5 and 4 animals, respectively) withTgCatBr60 strain (Type BrIII genotype). After chronification of infection, the animals were impregnated. A second infection was performed after 60 days of gestation. TheG1 andG3 animals were inoculated withTgCatBr60BrIII and the G2 animals withTgCatBr71 BrI oocysts. The effects of reinfection were compared with a control group (5 animals) through physical examination, ultrasound imaging and serology. Ovine experimental infections were evaluated using mouse bioassays, molecular analysis, serological tests, histopathology, and immunohistochemistry. No abortions occurred; a seropositive lamb and a mummified fetus from G2-BrIIIxBrI were produced. The vertical transmission rate detected in lambs from chronically infected sheep was 31.6% (6/19). It is demonstrated that reinfection and subsequent congenital transmission occured in one sheep with a primary Brl infection challenged with BrIII genotype of T. gondii. In a twin pregnancy from G2-BrIIIxBrI, congenital transmission from a latent infection was detected in both lambs. Congenital transmission could not be tracked in three lambs. Overall, previous T. gondii infection may fail to protect against congenital transmission from a reinfection and primary infection induced insufficient protection against vertical transmission which must be taken into account in decision-making for the use of seropositive animals as breeders. Similar trials with larger groups and contemplating host cellular immune response studies should be conducted to evaluate the actual impact of T. gondii reinfection involving different strains in sheep.
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Affiliation(s)
- Daniela Pontes Chiebao
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Hilda Fátima Pena
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Danielle Passarelli
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo, São Paulo, Brazil
| | - Thiago Santín
- Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Lidia Hildebrand Pulz
- Department of Pathology, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Ricardo Francisco Strefezzi
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo, São Paulo, Brazil
| | - Anaiá Paixão Sevá
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Camila Marinelli Martins
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Estela Gallucci Lopes
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - José Henrique Hildebrand Grisi Filho
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Solange Maria Gennari
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
| | - Rodrigo Martins Soares
- Department of Preventive Veterinary Medicine, Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo, São Paulo, Brazil
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Keid LB, Chiebao DP, Batinga MCA, Faita T, Diniz JA, Oliveira TMFDS, Ferreira HL, Soares RM. Brucella canis infection in dogs from commercial breeding kennels in Brazil. Transbound Emerg Dis 2017; 64:691-697. [PMID: 28296215 DOI: 10.1111/tbed.12632] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Indexed: 11/27/2022]
Abstract
Canine brucellosis caused by Brucella canis is a neglected zoonosis worldwide and is a leading cause of reproductive failure in dogs, often causing substantial economic losses in breeding kennels. This study aimed to investigate the occurrence of B. canis infection in dogs of commercial breeding kennels located in São Paulo State, Brazil. A total of 753 dogs (183 males and 570 females) from 38 commercial kennels were clinically examined, and blood samples were collected for brucellosis diagnosis through blood culture. The association between clinical manifestations suggestive of brucellosis and positive results through blood culture was determined. Of the 753 dogs tested, 166 (22.0%) had at least one clinical sign suggestive of brucellosis and 158 (20.9%) had positive blood cultures. Seventy-two dogs had positive blood culture and had at least one clinical sign suggestive of brucellosis, while 91 dogs showed at least one clinical manifestation suggestive of brucellosis although blood culture was negative. Of the 38 kennels, 16 (42.1%) had at least one positive dog. The prevalence of infection in each kennel varied from 3.8% to 62.6%. Abortion/stillbirth, failure to conceive and enlargement of lymph nodes were significantly associated with brucellosis in female. No association of clinical signs and positive results in blood culture was observed in males. None of the kennels has been carrying out programmes to control brucellosis, and the sale of infected dogs was considered a common practice yielding risks to the public health, in view of the zoonotic potential of the infection.
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Affiliation(s)
- L B Keid
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - D P Chiebao
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - M C A Batinga
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - T Faita
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - J A Diniz
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - T M F de S Oliveira
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - H L Ferreira
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brazil
| | - R M Soares
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brazil
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Chiebao DP, Valadas SYOB, Minervino AHH, Castro V, Romaldini AHCN, Calhau AS, De Souza RAB, Gennari SM, Keid LB, Soares RM. Variables Associated with Infections of Cattle by Brucella abortus., Leptospira spp. and Neospora spp. in Amazon Region in Brazil. Transbound Emerg Dis 2013; 62:e30-6. [PMID: 26302373 DOI: 10.1111/tbed.12201] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Indexed: 11/28/2022]
Abstract
The frequency of Neospora spp., Leptospira spp. and Brucella abortus infections in adult cattle was determined in herds of the State of Pará, Brazil, which is an important region for cattle production located in the Amazon region. A total of 3466 adult female cattle from 176 herds were tested, leading to a frequency of seropositive animals of 14.7%, 3.7% and 65.5% and a herd positivity of 87.4%, 41.3% and 98.8% for infections caused by Neospora spp., B. abortus and Leptospira spp., respectively. The five most frequently diagnosed serologic responses to Leptospira spp. were those against serovars hardjo, wolfii, grippotyphosa, hebdomadis and shermani. The following associations were found: practice of artificial insemination, large farm size, large herd size, large number of dogs and high number of total abortions per year with the presence of antibodies against serovar hardjo; positive results to serovar grippotyphosa with the presence of dogs; inappropriate disposal of aborted foetuses with positivity to serovar hebdomadis. Serovar grippotyphosa was also associated with number of episodes of abortions. Neospora spp. positive herds were associated with episodes of abortion and B. abortus infection with the disposal of dead animals and aborted foetuses on pastures and with the use of artificial insemination. In conclusion, the high frequency of brucellosis, leptospirosis and neosporosis in the region may be a consequence of social, natural and raising conditions as: (i) climate conditions that favour the survival and spread of pathogens in the environment; (ii) farms located in regions bordering forest areas; (iii) farms in areas of difficult access to the veterinary service; (iv) extensive beef herds raised at pastures with different age and productive groups inter-mingled; and (v) minimal concerns regarding hygiene practices and disease prevention measures.
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Affiliation(s)
- D P Chiebao
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - S Y O B Valadas
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - A H H Minervino
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - V Castro
- Agência Paulista de Tecnologia dos Agronegócios, Instituto Biológico, São Paulo, SP, Brasil
| | - A H C N Romaldini
- Agência Paulista de Tecnologia dos Agronegócios, Instituto Biológico, São Paulo, SP, Brasil
| | - A S Calhau
- Empresa Brasileira de Extensão Rural do Pará, Marituba, PA, Brasil
| | | | - S M Gennari
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
| | - L B Keid
- Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, SP, Brasil
| | - R M Soares
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil
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Niciura SCM, Veríssimo CJ, Gromboni JGG, Rocha MIP, de Mello SS, Barbosa CMP, Chiebao DP, Cardoso D, Silva GS, Otsuk IP, Pereira JR, Ambrosio LA, Nardon RF, Ueno TEH, Molento MB. F200Y polymorphism in the β-tubulin gene in field isolates of Haemonchus contortus and risk factors of sheep flock management practices related to anthelmintic resistance. Vet Parasitol 2012; 190:608-12. [DOI: 10.1016/j.vetpar.2012.07.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 07/11/2012] [Accepted: 07/12/2012] [Indexed: 11/24/2022]
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Keid LB, Soares RM, Vasconcellos SA, Chiebao DP, Megid J, Salgado VR, Richtzenhain LJ. A polymerase chain reaction for the detection of Brucella canis in semen of naturally infected dogs. Theriogenology 2007; 67:1203-10. [PMID: 17343907 DOI: 10.1016/j.theriogenology.2007.01.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Accepted: 01/07/2007] [Indexed: 11/19/2022]
Abstract
The objective was to evaluate a PCR assay for the detection of Brucella canis in canine semen, comparing its performance with that of bacterial isolation, serological tests and PCR assay of blood. Fifty-two male dogs were examined clinically to detect reproductive abnormalities and their serum was tested by the rapid slide agglutination test, with and without 2-mercaptoethanol (2ME-RSAT and RSAT, respectively). In addition, microbiological culture and PCR assays were performed on blood and semen samples. The findings of the semen PCR were compared (Kappa coefficient and McNemar test) to those of blood PCR, culture of blood and semen, RSAT, and 2ME-RSAT. Nucleic acid extracts from semen collected from dogs not infected with B. canis were spiked with decreasing amounts of B. canis RM6/66 DNA and the resulting samples subjected to PCR. In addition, semen samples of non-infected dogs were spiked with decreasing amounts of B. canis CFU and the resulting suspensions were used for DNA extraction and amplification. Of the 52 dogs that were examined, the following tests were positive: RSAT, 16 (30.7%); 2ME-RSAT, 5 (9.6%); blood culture, 14 (26.9%); semen culture, 11 (21.1%); blood PCR, 18 (34.6%); semen PCR, 18 (34.6%). The PCR assay detected as few as 3.8 fg of B. canis DNA experimentally diluted in 444.9 ng of canine DNA (extracted from semen samples of non-infected dogs). In addition, the PCR assay amplified B. canis genetic sequences from semen samples containing as little as 1.0 x 10(0) cfu/mL. We concluded that PCR assay of semen was a good candidate as a confirmatory test for the diagnosis of brucellosis in dogs; its diagnostic performance was similar to blood culture or blood PCR. Furthermore, the PCR assay of semen was more sensitive than the 2ME-RSAT or semen culture. Examination of semen by PCR should be included for diagnosis of brucellosis prior to natural mating or AI; in that regard, some dogs that were negative on serological and microbiological examinations as well as blood PCR were positive on PCR of semen.
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Affiliation(s)
- L B Keid
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo, São Paulo, SP, Brazil
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