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Andrade FP, Borges S, da Silva Filho CA, Martins TF, Benvenutti H, de Freitas JDMC, Thomé FS, Karohl C, Souza GC, Cipriano GFB, Rovedder PME. Respiratory sarcopenia screening in dialysis patients: cross-sectional and multicentre study protocol. BMC Nephrol 2024; 25:41. [PMID: 38287281 PMCID: PMC10826040 DOI: 10.1186/s12882-023-03390-0] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 11/06/2023] [Indexed: 01/31/2024] Open
Abstract
BACKGROUND Respiratory sarcopenia is characterized by the weakness of respiratory muscles associated with sarcopenia due to aging or systemic diseases such as chronic kidney disease (CKD). Patients with CKD undergoing dialysis are particularly susceptible to respiratory muscle weakness caused by factors such as fluid overload and electrolyte imbalance. This weakness not only affects ventilation but also impairs oxygen uptake and delivery to muscle tissue, potentially leading to severe sarcopenia. Thus, the objective of this study is to conduct a respiratory sarcopenia screening in patients with CKD undergoing haemodialysis (HD) and peritoneal dialysis (PD). METHODS This is an observational, cross-sectional and multicentre study conducted between March 2023 and March 2025. The study was approved by the Research Ethics Committee at two centres. Sarcopenia diagnosis is determined based on low handgrip strength and amount of appendicular skeletal muscle mass, assessed through bioelectrical impedance analysis. Respiratory sarcopenia is diagnosed in patients with sarcopenia who have low inspiratory muscle strength, evaluated through a manovacuometry test. The severity of sarcopenia and respiratory sarcopenia is defined, respectively, by low physical performance (measured using the Short Physical Performance Battery and Timed-Up and Go test) and pulmonary performance (measured through spirometry). Thus, this study will include 81 patients undergoing dialysis (41 on HD and 40 on PD) from three participating centres. DISCUSSION The literature has been focused on respiratory function in CKD; however, the relationship with sarcopenia remains understudied. We believe that, similar to appendicular skeleton muscles, the axial skeleton muscles are also likely to weaken with the presence of chronic disease, such as CKD.
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Affiliation(s)
- Francini Porcher Andrade
- Ciências Pneumológicas Post-Graduation Programme, Federal University of Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2400 2º andar, Porto Alegre, RS, 90035-003, Rio Grande do Sul, Brazil.
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul, Brazil.
- Research Center in Sports Sciences, Health Sciences and Human Development, University of Maia (CIDESD-UMAIA), Maia, Portugal.
| | - Sheila Borges
- Science and Technology in Health Programme, University of Brasília (UnB), Brasília, Distrito Federal, Brazil
| | - César Alencar da Silva Filho
- Ciências Pneumológicas Post-Graduation Programme, Federal University of Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2400 2º andar, Porto Alegre, RS, 90035-003, Rio Grande do Sul, Brazil
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul, Brazil
| | - Taís Ferreira Martins
- Sciences of Rehabilitation Post-Graduation Programme, University of Brasília (UnB), Brasilia, Distrito Federal, Brazil
| | - Heloíse Benvenutti
- Ciências Pneumológicas Post-Graduation Programme, Federal University of Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2400 2º andar, Porto Alegre, RS, 90035-003, Rio Grande do Sul, Brazil
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul, Brazil
| | - Júlia de Melo Cardoso de Freitas
- Medical Sciences Focused on Endocrinology Post-Graduation Programme, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Fernando Saldanha Thomé
- Faculty of Medicine, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
- Instituto de Doenças Renais (IDR), Porto Alegre, Rio Grande do Sul, Brazil
| | - Cristina Karohl
- Faculty of Medicine, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Gabriela Correa Souza
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul, Brazil
- Graduate Program in Food, Nutrition and Health, Medical School, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Graziella França Bernardelli Cipriano
- Science and Technology in Health Programme, University of Brasília (UnB), Brasília, Distrito Federal, Brazil
- Sciences of Rehabilitation Post-Graduation Programme, University of Brasília (UnB), Brasilia, Distrito Federal, Brazil
| | - Paula Maria Eidt Rovedder
- Ciências Pneumológicas Post-Graduation Programme, Federal University of Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2400 2º andar, Porto Alegre, RS, 90035-003, Rio Grande do Sul, Brazil
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul, Brazil
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Fecchio A, Lugarini C, Ferreira A, Weckstein JD, Kuabara KMD, De La Torre GM, Ogrzewalska M, Martins TF, de Angeli Dutra D. Migration and season explain tick prevalence in Brazilian birds. Med Vet Entomol 2021; 35:547-555. [PMID: 34018221 DOI: 10.1111/mve.12532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/06/2021] [Accepted: 05/10/2021] [Indexed: 06/12/2023]
Abstract
Neotropical birds are mostly parasitized by immature ticks and act as reservoir hosts of tick-borne pathogens of medical and veterinary interest. Hence, determining the factors that enable ticks to encounter these highly mobile hosts and increase the potential for tick dispersal throughout migratory flyways are important for understanding tick-borne disease transmission. We used 9682 individual birds from 572 species surveyed across Brazil and Bayesian models to disentangle possible avian host traits and climatic drivers of infestation probabilities, accounting for avian host phylogenetic relationships and spatiotemporal factors that may influence tick prevalence. Our models revealed that the probability of an individual bird being infested with tick larvae and nymphs was lower in partial migrant hosts and during the wet season. Notably, infestation probability increased in areas with a higher proportion of partial migrant birds. Other avian ecological traits known to influence tick prevalence (foraging habitat and body mass) and environmental condition that might constrain tick abundance (annual precipitation and minimum temperature) did not explain infestation probability. Our findings suggest that migratory flyways harbouring a greater abundance of migrant bird hosts also harbour a higher prevalence of immature ticks with potential to enhance the local transmission of tick-borne pathogens and spread across regions.
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Affiliation(s)
- A Fecchio
- Programa de Pós-graduação em Ecologia e Conservação da Biodiversidade, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - C Lugarini
- Centro Nacional de Pesquisa e Conservação de Aves Silvestres, Instituto Chico Mendes de Conservação da Biodiversidade, Florianópolis, Brazil
| | - A Ferreira
- Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - J D Weckstein
- Department of Ornithology, Academy of Natural Sciences of Drexel University, Philadelphia, PA, U.S.A
- Department of Biodiversity, Earth, and Environmental Sciences, Drexel University, Philadelphia, PA, U.S.A
| | - K M D Kuabara
- Department of Ornithology, Academy of Natural Sciences of Drexel University, Philadelphia, PA, U.S.A
- Department of Biodiversity, Earth, and Environmental Sciences, Drexel University, Philadelphia, PA, U.S.A
| | - G M De La Torre
- Programa de Pós-graduação em Ecologia e Conservação, Universidade Federal do Paraná, Curitiba, Brazil
| | - M Ogrzewalska
- Laboratório de Vírus Respiratórios e Sarampo, Instituto Oswaldo Cruz-IOC, Fundação Oswaldo Cruz-FIOCRUZ, Rio de Janeiro, Brazil
| | - T F Martins
- Departamento de Laboratórios Especializados, Superintendência de Controle de Endemias-SUCEN, Secretaria de Estado da Saúde de São Paulo, São Paulo, Brazil
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil
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Martins TF, Mendonça TN, Melo JM, Moreno AS, Januário YC, DaSilva LL, Dias MM, Meireles PR, Santos KS, Yang AC, Arruda LK. Reactions to Shrimp Including Severe Anaphylaxis in Mite- and Cockroach-Allergic Patients Who Have Never Eaten Shrimp: Clinical Significance of IgE Cross-Reactivity to Tropomyosins From Different Sources. J Investig Allergol Clin Immunol 2019; 29:302-305. [PMID: 31478527 DOI: 10.18176/jiaci.0378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- T F Martins
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - T N Mendonça
- Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - J Ml Melo
- Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - A S Moreno
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Y C Januário
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - L Lp DaSilva
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - M M Dias
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - P R Meireles
- Disciplina de Imunologia Clínica e Alergia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - K S Santos
- Disciplina de Imunologia Clínica e Alergia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - A C Yang
- Disciplina de Imunologia Clínica e Alergia, Hospital da Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil.,University of Campinas, São Paulo, Brazil
| | - L K Arruda
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.,Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
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Muñoz-Leal S, Martins TF, Luna LR, Rodriguez A, Labruna MB. A New Collection of Amblyomma parvitarsum (Acari: Ixodidae) in Peru, With Description of a Gynandromorph and Report of Rickettsia Detection. J Med Entomol 2018; 55:464-467. [PMID: 29045695 DOI: 10.1093/jme/tjx194] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Indexed: 06/07/2023]
Abstract
Adult stages of Amblyomma parvitarsum Neumann parasitize wild and domestic camelids of the genera Lama and Vicugna in highlands of Andean Plateau and Patagonia. Within the Peruvian Andes, few reports have documented this tick-host association, and although reported in Chile and Argentina, Rickettsia-infected A. parvitarsum remains undocumented for this country. Here we report a new collection of A. parvitarsum from Peru, the finding of the first gynandromorph for the species and high prevalence of Rickettsia in adult stages.
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Affiliation(s)
- S Muñoz-Leal
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenue Prof. Orlando Marques de Paiva, Cidade Universitária, São Paulo, SP, Brazil
| | - T F Martins
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenue Prof. Orlando Marques de Paiva, Cidade Universitária, São Paulo, SP, Brazil
| | - L R Luna
- Laboratorio de Biología y Genética Molecular, Departamento de Microbiología y Parasitología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, San Borja, Lima, Peru
| | - A Rodriguez
- Laboratorio de Biología y Genética Molecular, Departamento de Microbiología y Parasitología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, San Borja, Lima, Peru
| | - M B Labruna
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenue Prof. Orlando Marques de Paiva, Cidade Universitária, São Paulo, SP, Brazil
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Melo ALT, Witter R, Martins TF, Pacheco TA, Alves AS, Chitarra CS, Dutra V, Nakazato L, Pacheco RC, Labruna MB, Aguiar DM. A survey of tick-borne pathogens in dogs and their ticks in the Pantanal biome, Brazil. Med Vet Entomol 2016; 30:112-116. [PMID: 26467462 DOI: 10.1111/mve.12139] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 06/05/2015] [Accepted: 06/11/2015] [Indexed: 06/05/2023]
Abstract
Tick and blood samples collected from domestic dogs in the Brazilian Pantanal were tested by molecular methods for the presence of tick-borne protozoa and bacteria. Among 320 sampled dogs, 3.13% were infected by Babesia vogeli (Piroplasmida: Babesiidae), 8.75% by Hepatozoon canis (Eucoccidiorida: Hepatozoidae), 7.19% by Anaplasma platys (Rickettsiales: Anaplasmataceae), and 0.94% by an unclassified Anaplasma sp. In three tick species collected from dogs, the following tick-borne agents were detected: (a) B. vogeli, An. platys and Ehrlichia canis (Rickettsiales: Anaplasmataceae), infecting Rhipicephalus sanguineus sensu lato (Ixodida: Ixodidae) ticks; (b) H. canis, an unclassified Anaplasma sp. and Rickettsia amblyommii (Rickettsiales: Rickettsiaceae), infecting Amblyomma cajennense sensu lato (Ixodida: Ixodidae) ticks, and (c) Rickettsia sp. strain Atlantic rainforest, an emerging human pathogen, infecting Amblyomma ovale ticks. Molecular analysis, based on a mitochondrial gene, revealed that the Am. cajennense s.l. ticks of the present study corresponded to Amblyomma sculptum, a member of the Am. cajennense species complex, and that Rh. sanguineus s.l. belonged to the tropical lineage. Whereas dogs are exposed to a number of tick-borne bacterial and protozoan agents in the Pantanal biome, humans are potentially exposed to infection by spotted fever group rickettsiae (e.g. R. amblyommii and Rickettsia sp. strain Atlantic rainforest) because both Am. sculptum and Am. ovale are among the most important human-biting ticks in Brazil.
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Affiliation(s)
- A L T Melo
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - R Witter
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - T F Martins
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brazil
| | - T A Pacheco
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - A S Alves
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - C S Chitarra
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - V Dutra
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - L Nakazato
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - R C Pacheco
- Departamento de Ciências Básicas e Produção Animal, Faculdade de Agronomia, Medicina Veterinária e Zootecnia, Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
| | - M B Labruna
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brazil
| | - D M Aguiar
- Departamento de Clínica Médica Veterinária, Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil
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Silveira I, Martins TF, Olegário MM, Peterka C, Guedes E, Ferreira F, Labruna MB. Rickettsial Infection in Animals, Humans and Ticks in Paulicéia, Brazil. Zoonoses Public Health 2015; 62:525-33. [PMID: 25643912 DOI: 10.1111/zph.12180] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [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: 02/17/2012] [Indexed: 11/28/2022]
Abstract
A previous study in Paulicéia Municipality, south-eastern Brazil, reported 9.7% of the Amblyomma triste ticks to be infected by Rickettsia parkeri, a bacterial pathogen that causes spotted fever in humans. These A. triste ticks were shown to be associated with marsh areas, where the marsh deer Blastocerus dichotomus is a primary host for this tick species. During 2008-2009, blood serum samples were collected from 140 horses, 41 dogs, 5 opossums (Didelphis albiventris) and 26 humans in farms from Pauliceia Municipality. Ticks were collected from these animals, from vegetation and from additional wildlife in these farms. Overall, 25% (35/140) of the horses, 7.3% (3/41) of the dogs, 3.8% (1/26) of the humans and 100% (5/5) of the opossums were seroreactive (titre ≥64) to spotted fever group (SFG) Rickettsia spp. Multivariate statistical analysis indicated that horses that were allowed to forage in the marsh were 4.8 times more likely to be seroreactive to spotted fever group (SFG) Rickettsia spp than horses that did not forage in the marsh. In addition, horses that had been living in the farm for more than 8.5 years were 2.8 times more likely to be seroreactive to SFG Rickettsia spp than horses that were living for ≤8.5 years. Ticks collected from domestic animals or from vegetation included Amblyomma cajennense, Amblyomma coelebs, Amblyomma dubitatum, Dermacentor nitens and Rhipicephalus microplus. By PCR analyses, only one pool of A. coelebs ticks from the vegetation was shown to be infected by rickettsiae, for which DNA sequencing revealed to be Rickettsia amblyommii. Ticks (not tested by PCR) collected from wildlife encompassed A. cajennense and Amblyomma rotundatum on lizards (Tupinambis sp), and A. cajennense and A. triste on the bird Laterallus viridis. Our results indicate that the marsh area of Paulicéia offers risks of infection by SFG rickettsiae.
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Affiliation(s)
- I Silveira
- Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary, University of São Paulo, São Paulo, Brazil
| | - T F Martins
- Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary, University of São Paulo, São Paulo, Brazil
| | - M M Olegário
- Federal University of Uberlândia, Uberlândia, Brazil
| | - C Peterka
- Tropical Medicine Foundation of Tocantins (Funtrop), Araguaína, Brazil
| | - E Guedes
- Parasitology Laboratory, Embrapa Dairy Cattle, Rua Eugênio do Nascimento, Juiz de Fora, Brazil
| | - F Ferreira
- Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary, University of São Paulo, São Paulo, Brazil
| | - M B Labruna
- Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary, University of São Paulo, São Paulo, Brazil
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Scofield A, Bahia M, Martins AL, Góes-Cavalcante G, Martins TF, Labruna MB. Amblyomma dissimile Koch (Acari: Ixodidae) attacking Primolius maracana Vieillot (Psittaciformes: Psittacidae) in the Amazon region, State of Pará, Brazil. Neotrop Entomol 2011; 40:509-511. [PMID: 21952971 DOI: 10.1590/s1519-566x2011000400017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Accepted: 01/31/2011] [Indexed: 05/31/2023]
Abstract
The tick Amblyomma dissimile Koch feeds preferentially on reptiles (Squamata), although amphibians (Anura) also seem to be important hosts. We report an A. dissimile nymph infesting a blue-winged macaw, Primolius maracana, held in captivity in the Mangal das Garças Park, State of Pará, Brazil. Environmental observations suggest that free-living iguanas (Iguana iguana), which used to walk on the bird enclosure in the park, were the source of the A. dissimile tick that infested the blue-winged macaw. We provide the second world record of a bird host for A. dissimile, and the first bird record for this species in South America.
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Affiliation(s)
- A Scofield
- Faculdade de Medicina Veterinária, Universidade Federal do Pará, Castanhal, PA, Brasil
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Rubini AS, Paduan KS, Martins TF, Labruna MB, O'Dwyer LH. Acquisition and transmission of Hepatozoon canis (Apicomplexa: Hepatozoidae) by the tick Amblyomma ovale (Acari: Ixodidae). Vet Parasitol 2009; 164:324-7. [PMID: 19501969 DOI: 10.1016/j.vetpar.2009.05.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 03/26/2009] [Accepted: 05/06/2009] [Indexed: 10/20/2022]
Abstract
The present study aimed to evaluate under controlled conditions the acquisition of Hepatozoon canis by Amblyomma ovale after feeding on infected dogs, and the subsequent induction of infection in uninfected dogs that ingested the experimentally infected ticks. Two H. canis naturally infected dogs were infested with A. ovale adult ticks derived from an uninfected laboratory tick colony. After feeding, two A. ovale females presented H. canis oocysts in the hemolymph at the first and fourth days after removal of ticks from dogs. The oocysts had an average size of 244.34 microm x 255.46 microm. Three uninfected dogs were fed with ticks previously fed on the infected dogs. Only one dog became infected 32 days after oral inoculation, presenting circulating gametocytes, parasitemia less than 1%, and positive PCR confirmed to be H. canis by DNA sequencing. The results obtained indicated A. ovale ticks as potential vector of H. canis in rural areas of Brazil.
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Affiliation(s)
- A S Rubini
- Departamento de Parasitologia, Instituto de Biociências, Universidade Estadual Paulista Julio de Mesquita Filho, Distrito de Rubião Jr s/n, CEP 18618-000, Botucatu, São Paulo, Brazil.
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