Simulium species of the amazonicum group as vectors of Mansonella ozzardi in the Brazilian Amazon

Shelley, A. J.; Dias, A. P. A. Luna; Moraes, Mário Augusto Pinto de

doi:10.1016/0035-9203(80)90200-x

Cited by 39 publications

(28 citation statements)

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“…This study reports new species occurring in Rondônia: C. pydanielli, E. rorotaense, C. cauchense, C. ulyssesi, and N. exiguua and also fauna with potential for M. ozzardi transmission (C. pydanielli, C. argentiscutum, C. amazonicum) 14,15 . Among these species, C. pydanielli was frequently captured and found to be exerting hematophagic activity.…”

Section: Discussionmentioning

confidence: 88%

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Investigação da ocorrência da Mansonella ozzardi no Estado de Rondônia, Amazônia Ocidental

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Camargo

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et al. 2011

Rev. Soc. Bras. Med. Trop.

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Introduction: Mansonella ozzardi, a human filarial nematode transmitted by Diptera Simuliidae flies (black flies), is widely spread in the Amazon, while the occurrence of mansonelliasis in the State of Rondônia (Western Amazonia) has not been reported thus far. The existence of this parasitic disease in this state is investigated in this study. Methods: A total of 4,452 people who lived alongside the Madeira, Mamore, Guapore, Machado and Preto Rivers, in the State of Rondônia, were examined using the thick blood smear method. Alongside the Machado and Guapore rivers, 2,112 adult simuliid specimens were captured. Results: Infected people were not reported, although simuliids with vector potential such as Cerqueirellum pydanielli, C. argentiscutum and C. amazonicum were found. Conclusions: This study registered no infected people. This finding may be explained by the individuals' low level of microfilaremia that is below the limit of detection of the diagnostic method used in the study or insufficient migration of people infected with M. ozzardi from endemic areas, making it impossible to introduce the disease into Rondônia. Further studies using more sensitive diagnostic techniques could shed light on this question.Keywords: Mansonella ozzardi. Microfilariae. Simuliidae. State of Rondônia. RESUMOIntrodução: Mansonella ozzardi é uma filária humana que tem como vetor dípteros simulídeos e é amplamente distribuída na Amazônia. Não há informações sobre a ocorrência de casos de mansonelose no Estado de Rondônia, e neste trabalho procurou-se investigar a situação epidemiológica desta parasitose em áreas urbanas e ribeirinhas na Amazônia Ocidental. Métodos: Foram examinados 4.452 moradores às margens dos rios Madeira, Mamoré, Guaporé, Machado e Preto em Rondônia, através da técnica da gota espessa de sangue. Capturou-se às margens do rio Machado e Guaporé 2.112 simulídeos adultos das espécies Cerqueirellum pydanieli e Chirostilbia pertinax. Resultados: Não foram encontradas pessoas infectadas com M. ozzardi e foram encontradas diferentes espécies de simulídeos com potencial de transmissão da mansonelose. Conclusões: Não foram encontrados indivíduos infectados com M. ozzardi neste estudo. Este fato pode ser explicado pela existência de pacientes com baixas microfilaremias, associado à técnica diagnóstica de baixa sensibilidade utilizada no estudo. Pode-se ainda aventar a possibilidade de ter ocorrido migração insuficiente de pacientes infectados de áreas endêmicas, impossibilitando a implantação da endemia. Estudos posteriores com técnicas diagnósticas mais sensíveis podem ajudar a esclarecer esta questão. Palavras-chaves:Mansonella ozzardi. Microfilárias. Simuliidae. Rondônia.

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Section: Discussionmentioning

confidence: 88%

“…In Brazil, only insects of the Simuliidae family transmit M. ozzardi: Cerqueirellum amazonicum, C. argentiscutum and C. oyapockense [12][13][14] and more recently C. pydanielli are potential vectors for mansonelliasis in the State of Amazonas 15 .…”

Section: Introductionmentioning

confidence: 99%

Investigação da ocorrência da Mansonella ozzardi no Estado de Rondônia, Amazônia Ocidental

Basano

Camargo

Vera

et al. 2011

Rev. Soc. Bras. Med. Trop.

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“…Up to now, only the Simuliidaes have been identified as vectors in Brazil 8,9 . Infection symptomatology has been widely discussed and according to Batista et al 10 , people suffering from mansonelliasis present moderate fever, leg coldness, joint aches, dizziness and headaches.…”

Section: Introductionmentioning

confidence: 99%

Improvement of a PCR test to diagnose infection by Mansonella ozzardi

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Camargo

et al. 2011

Rev. Soc. Bras. Med. Trop.

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INTRODUCTION: Mansonelliasis is caused by Mansonella ozzardi. It is widespread in the Amazon region, with a high prevalence. The common exam of thick blood smears stained with Giemsa shows low efficacy levels and has been an obstacle to diagnosing individuals with low blood parasitemia. METHODS: In order to increase diagnosis efficacy, the PCR technique was improved. RESULTS AND CONCLUSIONS: PCR demonstrated the best performance, with sensitivity and negative predictive values (NPV) of 100%, followed by blood filtration through membrane filters, which showed a sensitivity of 88.9% and a NPV of 84.6%, when compared to thick blood smears.

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“…For example, in the community of Mapiri, we found a PIR of 6,38%, while Shelley & Shelley (1976) recorded a PIR of 0.99% in black flies captured along the Purus River, in the municipality of Lábrea. Shelley et al (1980) found an infection rate of 3.1% in simuliids collected among the Ticunas along higher Solimões river. The diference of PIR between the studied communities just can be explained with a systematic collections of black flies during at least a year because the fluctuation of seasonality (e.g.…”

Section: Discussionmentioning

confidence: 85%

“…In Brazil, only simuliids are recognized as vectors, and were first recorded by Cerqueira (1959) who found Simulium amazonicum (= Cerqueirellum argentiscutum) infected with larvae of M. ozzardi. Shelley & Shelley (1976) found S. amazonicum (= C. amazonicum) incrimined as a vector in the Purus river, Amazonas; and Shelley et al (1980) found S. amazonicum (= C. amazonicum) and S. argentiscutum (= C. argentiscutum) to be vectors in the high Solimões river. Moraes et al (1985) demonstrated that S. oyapockense (= C. oyapockense) was a vector in the state of Roraima.…”

Section: Introductionmentioning

confidence: 99%

Epidemiological studies of Mansonella ozzardi (Nematoda, Onchocercidae) in indigenous communities of Pauini municipality, Amazonas, Brazil

et al. 2007

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The Mansonella ozzardi has a widespread distribution among the indigenous and riverine communities of Amazonas, Brazil. We estimated the prevalence of Mansonella ozzardi in indigenous communities of the Pauini municipality, Amazonas state, Brazil and the rate of parasitic infection in vectors. We collected thick blood smears from individuals from six Apurinã indigenous communities along the Purus River and its tributaries. Collections of simuliids were made and dissected, and the larval instars of M. ozzardi identified. The overall prevalence of M. ozzardi was 28.40%, with the highest incidence among males and agricultural workers. Among age groups, children 2-9 years of age had the lowest incidence, while individuals older than 58 exhibited the highest rates of infection. We found infected simuliids in three communities, with Parasitic Infection Rates (PIR) of 0.34-6.58%. The prevalence of M. ozzardi among the Apurinã people is high, possibly related to the diary activities of the riparian people, where a high abundance of the vectors exists. KEY WORDSMansonella ozzardi, Mansonelliasis, Simuliidae, Amazonas, Brazil. Estudos Epidemiológicos da

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Simulium species of the amazonicum group as vectors of Mansonella ozzardi in the Brazilian Amazon

Cited by 39 publications

References 5 publications

Investigação da ocorrência da Mansonella ozzardi no Estado de Rondônia, Amazônia Ocidental

Investigação da ocorrência da Mansonella ozzardi no Estado de Rondônia, Amazônia Ocidental

Improvement of a PCR test to diagnose infection by Mansonella ozzardi

Epidemiological studies of Mansonella ozzardi (Nematoda, Onchocercidae) in indigenous communities of Pauini municipality, Amazonas, Brazil

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