ORCID Profile
0000-0003-3289-1445
Current Organisation
Murdoch University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: FapUNIFESP (SciELO)
Date: 08-2008
DOI: 10.1590/S0102-09352008000400010
Abstract: Estudou-se a epidemiologia da raiva em cães e gatos, em Minas Gerais, e realizou-se um estudo descritivo de seu comportamento, de 2000 a 2006. Utilizaram-se, como fonte de dados, os relatórios mensais dos laboratórios do Centro de Controle de Zoonoses de Belo Horizonte e do Instituto Mineiro de Agropecuária. Os resultados demonstraram positividade de 1,5% para raiva canina e 0,7% para raiva felina. Houve tendência ao decréscimo do número de casos positivos de raiva canina (y = -3,2143x + 19,714) e também para a raiva felina, com apenas dois casos, ambos em 2000. As regiões com diagnóstico positivo coincidiram com as de menor desenvolvimento sócioeconômico.
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.IJPARA.2018.05.002
Abstract: Recent molecular and sero-surveillance studies of the tick-borne pathogen Hepatozoon canis have identified new hosts, potential vector species, and have revealed that H. canis is more widespread than previously thought. We report the first diagnosed case of canine hepatozoonosis in Australia from a Maremma Sheepdog in Sarina, Queensland. Hepatozoon canis was detected with blood smear examination and 18S rRNA sequencing. It is unknown when or how the organism was introduced into Australia, which raises questions about border biosecurity policies and the H. canis infection status of its potential vectors and hosts in Australia. Surveillance for this pathogen is required to determine whether H. canis has established in Australia.
Publisher: Springer Science and Business Media LLC
Date: 19-03-2015
DOI: 10.1007/S00436-015-4418-Y
Abstract: The canine visceral leishmaniasis (CVL) diagnosis is an important step of visceral leishmaniasis control program in Brazil once the dog is the main reservoir host of the disease. The aim of this study was to evaluate the conjunctival swab (CS) as a mass-screening tool for CVL molecular diagnosis in an endemic area classified as priority for the Brazilian Ministry of Healthy for surveillance action. A total of 1350 domiciled dogs were screened. The animals were evaluated by serological tests (enzyme-linked immunosorbent assay (ELISA) as screening and immunofluorescence antibody test (IFAT) for confirmation) and by CS associated to real-time PCR, using primers addressed to kinetoplast DNA (kDNA) minicircles and SYBR Green. Canine β-globin gene lification was used to evaluate the s le DNA integrity. A subgroup of 484 animals was also submitted to clinical evaluation. Among the 1350 dogs screened, 369 (27.3%) were positive by CS real-time PCR and 126 (9.3%) tested positive by ELISA. Thirty-one percent (39/126) of the ELISA-positive dogs were confirmed by IFAT. CS real-time PCR was able to detect infection in dogs independently of the symptomatology degree (p > 0.05), while ELISA was more sensitive in the group of dogs that present three or more clinical signs related to CVL. The results demonstrated that CS real-time PCR was able to detect a higher number of infected dogs than ELISA and that the prevalence of canine infections has been underestimated by the serological assays. The use of sensitive molecular diagnostic methods like CS real-time PCR, mainly in endemic areas, could greatly contribute to disease control.
Publisher: Public Library of Science (PLoS)
Date: 13-07-2017
Publisher: Wiley
Date: 26-06-2017
DOI: 10.1111/AVJ.12597
Publisher: FapUNIFESP (SciELO)
Date: 06-2014
Abstract: Acidentes por escorpião constituem problema de saúde pública em Belo Horizonte. Realizou-se um estudo epidemiológico observacional retrospectivo para analisar a frequência e distribuição espacial dos acidentes escorpiônicos em Belo Horizonte, entre 2005 e 2009, e associá-las às categorias de risco classificadas pelo Índice de Vulnerabilidade à Saúde (IVS), um índice socioeconômico regional composto. Foram utilizados dados de notificação do Sistema Nacional de Agravos de Notificação (SINAN) e Sistema de Vigilância Epidemiológica (SISVE), referentes aos anos de 2008 e 2009. Para o período de 2005 a 2007, foi necessário o resgate de dados das fichas clínicas do Hospital João XXIII (HPSJXXIII) correspondentes às variáveis encontradas no SINAN e SISVE, uma vez que os mesmos não estavam digitalizados nos referidos sistemas de informação. Para georreferenciamento e análise espacial, foi utilizada a base geográfica EndGeo, o aplicativo de mapeamento MapInfo versão 10.0 e os programas Hotspot Detective e SatScan. Entre 2005 e 2009, ocorreram em Belo Horizonte 2.769 casos de acidentes por escorpião, o que representa uma incidência média de 22,4 casos por 100.000 habitantes. Do total de casos, 1.924 (69,5%) foram georreferenciados e houve predomínio de incidência em dois Distritos Sanitários (DS), com grande concentração de casos nas regiões de cemitérios do município. Foram detectados dois "clusters" no período, sendo um em 2005, nos DS Noroeste e Oeste, e outro entre 2006 e 2007, nos DS Noroeste e Nordeste. Não houve associação entre as áreas de maior incidência de escorpionismo e as áreas de maior risco à saúde classificadas pelo IVS. Com base nos resultados, conclui-se que há necessidade de melhorias no processo de notificação do agravo e que o mapeamento dos casos é uma ferramenta relevante capaz de embasar o direcionamento das ações educativas de controle para as áreas prioritárias de Belo Horizonte.
Publisher: Public Library of Science (PLoS)
Date: 18-12-2019
Publisher: Elsevier BV
Date: 04-2018
Publisher: MDPI AG
Date: 19-10-2023
Publisher: FapUNIFESP (SciELO)
Date: 06-2008
DOI: 10.1590/S0102-09352008000300007
Abstract: Estudou-se a situação epidemiológica da raiva bovina em Minas Gerais de 1998 a 2006. Foram avaliadas 6873 fichas de diagnóstico de raiva por imunofluorescência direta. Para análise da distribuição temporal da raiva, foram construídas tabelas e gráficos no software Excel 2003 e o mapeamento dos diagnósticos foi feito no aplicativo Tabwin 1.4. Verificou-se tendência anual decrescente do número de exames e dos diagnósticos positivos (Y= -41,133x+544,89). Os meses de maio, junho e julho apresentaram o maior percentual de diagnósticos positivos. O número de municípios com raiva bovina variou ao longo do período estudado e manteve tendência decrescente (Y= -7,0833x+166,64), com expansão da doença para os municípios da região do Triângulo Mineiro.
Publisher: Elsevier BV
Date: 2023
Abstract: Tick-borne diseases (TBDs) are a growing global health concern. Despite extensive studies, ill-defined tick-associated pathologies remain with unknown aetiologies. Human immunological responses after tick bite, and inter-in idual variations of immune-response phenotypes, are not well characterised. Current reductive experimental methodologies limit our understanding of more complex tick-associated illness, which results from the interactions between the host, tick, and microbes. An unbiased, systems-level integration of clinical metadata and biological host data - obtained via transcriptomics, proteomics, and metabolomics - offers to drive the data-informed generation of testable hypotheses in TBDs. Advanced computational tools have rendered meaningful analysis of such large data sets feasible. This review highlights the advantages of integrative system biology approaches as essential for understanding the complex pathobiology of TBDs.
Publisher: Oxford University Press (OUP)
Date: 02-2021
DOI: 10.1093/CID/CIAA089
Abstract: Hemotropic mycoplasmas (hemoplasmas) infect animals and humans and can lead to clinical syndromes mainly characterized by hemolytic anemia. A novel pathogen, Candidatus Mycoplasma haemohominis, was recently associated with a case of human hemoplasmosis in Europe. Here we report the first detection of this pathogen in an Australian patient exhibiting persistent fever, hemolytic anemia, and pancytopenia over a 10-month period. After exhaustive negative testing for human infectious diseases, whole genome sequencing (WGS) was performed on the patient’s bone marrow aspirate, using an Illumina NextSeq500 platform. Conventional polymerase chain reaction (PCR), followed by Sanger sequencing, was then performed on blood s les using novel Mycoplasma-specific primers targeting the 16S ribosomal RNA gene. In addition, a Mycoplasma-specific fluorescence in situ hybridization (FISH) assay was developed to differentiate Mycoplasma cells from other erythrocyte inclusions (eg, Pappenheimer and Howell-Jolly bodies) which are morphologically similar to bacterial cocci by light microscopy. WGS analysis revealed that approximately 0.04% of the total number of unmapped reads to human genome corresponded to Mycoplasma species. A 1-kb Mycoplasma 16S fragment was successfully lified by conventional PCR, and sequence analyses revealed 100% identity with Candidatus Mycoplasma haemohominis. FISH confirmed that several (approximately 2%) epierythrocytic inclusions initially observed by light microscopy corresponded to Mycoplasma cells. This represents the second report of hemolytic anemia associated with hemoplasma infection in a human, and the first report of human hemoplasmosis in Australia. This study highlights the importance of new and emerging diagnostic approaches and need for further investigations on the epidemiology of Candidatus Mycoplasma haemohominis in Australia.
Publisher: Elsevier BV
Date: 04-2017
DOI: 10.1016/J.VETPAR.2017.04.007
Abstract: A molecular survey was conducted to provide baseline information on the prevalence, genetic ersity and potential clinical impacts of blood-borne and enteric protozoans in native wild mammals from the Northern Territory (NT). A total of 209 blood and 167 faecal s les were collected from four target species the northern brown bandicoot (Isoodon macrourus), common brushtail possum (Trichosurus vulpecula), northern quoll (Dasyurus hallucatus) and brush-tailed rabbit-rat (Conilurus penicillatus). Blood s les were screened by PCR at the 18S rRNA gene for trypanosomes, piroplasms and haemogregarines, with faecal s les tested for Cryptosporidium spp. at the 18S rRNA locus, and for Giardia spp. at the glutamate dehydrogenase (gdh) and 18S rRNA loci. The potential clinical impact was investigated by associating clinical, haematological and biochemical parameters with presence or absence of infection. Overall, 22.5% (95% CI: 17.0-28.8%) of the animals tested were positive for haemoprotozoans. Trypanosomes were found in 26.6% (95% CI: 18.7-35.7%) of the bandicoots and were identified as Trypanosoma vegrandis G6, except for one unique genotype, most similar to T. vegrandis G3 (genetic distance=7%). The prevalence of trypanosomes in possums was 23.7% (95% CI: 11.4-40.2%), and the genotypes identified clustered within the T. noyesi clade. The presence of Babesia sp. and Hepatozoon sp. was confirmed in bandicoots only, both at a prevalence of 9.7% (95% CI: 2.7-9.2%). The total prevalence of intestinal protozoan parasites observed was relatively low (3% 95% CI: 1.0-6.9%). No evidence of clinical disease associated with protozoan parasitic infection was observed, however bandicoots positive for Trypanosoma exhibited a significantly lower packed cell volume (PCV) compared to negative bandicoots (p=0.046). To the authors' knowledge, this is the first research conducted in the NT to characterise protozoan parasites in threatened native mammals using both molecular and morphological tools and to assess the potential clinical impacts of these agents. The absence of clear signs of major morbidity in infected animals seems to exclude a direct association between infections with these agents and possible population decline events in northern Australian native mammals. However until the cause(s) of population decline are ascertained for each in idual mammal species, further studies are required. The outcome of the present investigation may be used to inform wildlife conservation and zoonotic disease programs.
Publisher: MDPI AG
Date: 03-11-2022
DOI: 10.3390/PATHOGENS11111290
Abstract: In Australia, there is a paucity of data about the extent and impact of zoonotic tick-related illnesses. Even less is understood about a multifaceted illness referred to as Debilitating Symptom Complexes Attributed to Ticks (DSCATT). Here, we describe a research plan for investigating the aetiology, pathophysiology, and clinical outcomes of human tick-associated disease in Australia. Our approach focuses on the transmission of potential pathogens and the immunological responses of the patient after a tick bite. The protocol is strengthened by prospective data collection, the recruitment of two external matched control groups, and sophisticated integrative data analysis which, collectively, will allow the robust demonstration of associations between a tick bite and the development of clinical and pathological abnormalities. Various laboratory analyses are performed including metagenomics to investigate the potential transmission of bacteria, protozoa and/or viruses during tick bite. In addition, multi-omics technology is applied to investigate links between host immune responses and potential infectious and non-infectious disease causations. Psychometric profiling is also used to investigate whether psychological attributes influence symptom development. This research will fill important knowledge gaps about tick-borne diseases. Ultimately, we hope the results will promote improved diagnostic outcomes, and inform the safe management and treatment of patients bitten by ticks in Australia.
Publisher: FapUNIFESP (SciELO)
Date: 09-2012
DOI: 10.1590/S0102-311X2012000900016
Abstract: Realizou-se um estudo epidemiológico observacional retrospectivo para caracterizar os acidentes escorpiônicos em Belo Horizonte, Minas Gerais, Brasil, entre 2005 e 2009. Foram coletados dados do Sistema Nacional de Informação de Agravos de Notificação (SINAN) e Sistema de Vigilância Epidemiológica (SISVE) e das fichas de atendimento do Hospital João XXIII. Observou-se um total de 2.769 casos no período (114,7/100 mil habitantes), tendência decrescente e maior ocorrência entre agosto e janeiro. A espécie Tityus serrulatus foi responsável pela maioria das picadas. Não houve diferença estatística entre os gêneros dos in íduos acometidos e a faixa etária entre 55 e 64 anos foi a que apresentou maior risco para escorpionismo. Noventa e seis por cento dos quadros clínicos evoluíram para a cura, tendo sido observados dois óbitos. Alerta-se para necessidade de melhorias no processo de notificação de acidentes por escorpião e sugere-se considerar seus determinantes para o planejamento e direcionamento de intervenções por parte do serviço público de saúde.
Publisher: Wildlife Disease Association
Date: 02-07-2020
DOI: 10.7589/2019-05-120
Publisher: Elsevier BV
Date: 02-2018
DOI: 10.1016/J.TTBDIS.2017.12.011
Abstract: Worldwide, Ehrlichia spp. are emerging infectious organisms of domestic animals and people, however, most Ehrlichia spp. naturally infect wildlife reservoirs causing mainly asymptomatic infections. Australian ecosystems have been under-explored for these potentially pathogenic organisms, and recent studies have identified a range of novel Ehrlichia, and their sister genera, Anaplasma and 'Candidatus Neoehrlichia' species, from native Australian ticks. We used bacterial 16S rRNA (16S) next-generation sequencing and genus-specific PCR to profile the bacterial communities in platypus (Ornithorhynchus anatinus) blood s les and platypus ticks (Ixodes ornithorhynchi), and identified a high prevalence of Ehrlichia sequences. We also observed Ehrlichia-like intra-neutrophilic inclusions (morulae) in PCR-positive stained platypus blood films that were consistent in morphology with other Ehrlichia spp. Bayesian phylogenetic analysis of 16S (1343 bp), gltA (1004 bp), and groEL (1074 bp) gene sequences group the platypus Ehrlichia with 'Candidatus Ehrlichia khabarensis' from far-eastern Russia, and demonstrate that the platypus Ehrlichia is clearly distinct from all other Ehrlichia spp. Enough genetic ergence exists to delineate this platypus Ehrlichia as a separate species that we propose to designate 'Candidatus Ehrlichia ornithorhynchi'. There is no evidence that 'Candidatus Ehrlichia ornithorhynchi' causes disease in wild platypuses, however, the organism does seem to be widespread in Australia, being found in both Queensland and Tasmania. 'Candidatus Ehrlichia ornithorhynchi' is the second native Australian Ehrlichia described and adds to the rapidly growing ersity of recently described native Australian tick-borne bacteria.
Publisher: MDPI AG
Date: 06-09-2021
DOI: 10.3390/PATHOGENS10091148
Abstract: Bats (order Chiroptera) have been increasingly recognised as important reservoir hosts for human and animal pathogens worldwide. In this context, molecular and microscopy-based investigations to date have revealed remarkably high ersity of Trypanosoma spp. harboured by bats, including species of recognised medical and veterinary importance such as Trypanosoma cruzi and Trypanosoma evansi (aetiological agents of Chagas disease and Surra, respectively). This review synthesises current knowledge on the ersity, taxonomy, evolution and epidemiology of bat trypanosomes based on both molecular studies and morphological records. In addition, we use a One Health approach to discuss the significance of bats as reservoirs (and putative vectors) of T. cruzi, with a focus on the complex associations between intra-specific genetic ersity and eco-epidemiology of T. cruzi in sylvatic and domestic ecosystems. This article also highlights current knowledge gaps on the biological implications of trypanosome co-infections in a single host, as well as the prevalence, vectors, life-cycle, host-range and clinical impact of most bat trypanosomes recorded to date. Continuous research efforts involving molecular surveillance of bat trypanosomes are required for improved disease prevention and control, mitigation of biosecurity risks and potential spill-over events, ultimately ensuring the health of humans, domestic animals and wildlife globally.
Publisher: Elsevier BV
Date: 06-2016
Publisher: MDPI AG
Date: 12-01-2023
DOI: 10.3390/PATHOGENS12010125
Abstract: Bovine anaemia caused by Theileria orientalis group (BATOG) causes significant production and economic losses in Australia’s cattle industry. The pathogenic T. orientalis genotypes reported in Australian cattle are type 1 (Chitose) and type 2 (Ikeda). The present study aimed to determine the prevalence and distribution of T. orientalis genotypes in adult lactating cows in Western Australia (WA) dairy herds. A total of 100 whole blood s les from lactating cows from 10 farms were obtained and screened for T. orientalis using polymerase chain reaction (PCR). Sanger sequencing was subsequently used to characterise T. orientalis genotypes isolated from positive s les. A total of thirteen cows (13% 95% CI: 7.1–21.2%) were positive for T. orientalis, and six out of ten farms (60% 95% CI: 26.2–87.8%) housed at least one T. orientalis-positive cow. The distribution of T. orientalis was found to be wide and dense in the South west region of WA and the southern coast of WA. The predominant T. orientalis genotype identified was Ikeda (n = 11, 11% 95% CI: 5.6–18.8%), while the Buffeli genotype was identified in WA for the first time, albeit at a low prevalence (n = 1, 1% 95% CI: 0.0–5.4%). This study has provided useful epidemiological evidence on the prevalence and distribution of T. orientalis in adult lactating dairy cows in WA dairy farms, and on the importance of conducting widespread surveillance programs for the understanding of BATOG in WA.
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.PARINT.2016.03.004
Abstract: The present study describes the first report of Trypanosoma vegrandis in koalas using morphology and sequence analysis of the 18S rRNA gene. The prevalence of T. vegrandis in koalas was 13.6% (6/44). It is likely that the small size of T. vegrandis (<10μm in length), coupled with the difficulties in lifying DNA of this parasite in mixed infections using trypanosome generic primers, are the reason why this organism has not been identified in koalas until now. This study highlights the importance of further research comprising a larger s le size to determine the prevalence of T. vegrandis in koalas as well as its potential impacts upon this marsupial species' health.
No related grants have been discovered for Amanda Duarte Barbosa.