Abstract:
:Rhodnius ecuadoriensis is the second most important vector of Chagas Disease (CD) in Ecuador. The objective of this study was to describe (and compare) the life cycle, the feeding and defecation patterns under laboratory conditions of two populations of this specie [from the provinces of Manabí (Coastal region) and Loja (Andean region)]. Egg-to-adult (n = 57) development took an average of 189.9 +/- 20 (Manabí) and 181.3 +/- 6.4 days (Loja). Mortality rates were high among Lojan nymphs. Pre-feeding time (from contact with host to feeding initiation) ranged from 4 min 42 s [nymph I (NI)] to 8 min 30 s (male); feeding time ranged from 14 min 45 s (NI)-28 min 25 s (male) (Manabí) and from 15 min 25 s (NI)-28 min 57 s (nymph V) (Loja). The amount of blood ingested increased significantly with instar and was larger for Manabí specimens (p < 0.001). Defecation while feeding was observed in Manabí specimens from stage nymph III and in Lojan bugs from stage nymph IV. There was a gradual, age-related increase in the frequency of this behaviour in both populations. Our results suggest that R. ecuadoriensis has the bionomic traits of an efficient vector of Trypanosoma cruzi. Together with previous data on the capacity of this species to infest rural households, these results indicate that control of synanthropic R. ecuadoriensis populations in the coastal and Andean regions may have a significant impact for CD control in Ecuador and Northern Peru.
journal_name
Mem Inst Oswaldo Cruzjournal_title
Memorias do Instituto Oswaldo Cruzauthors
Villacís AG,Arcos-Terán L,Grijalva MJdoi
10.1590/s0074-02762008000700011subject
Has Abstractpub_date
2008-11-01 00:00:00pages
690-5issue
7eissn
0074-0276issn
1678-8060pii
S0074-02762008000700011journal_volume
103pub_type
杂志文章abstract::This paper examines the distribution and infection of Biomphalaria glabrata with Schistosoma mansoni in all aquatic snail habitats in a rural area in the state of Minas Gerais, Brazil, in relation to physico/biotic and behavioral factors. Snail and environmental surveys were carried out semi-annually between July 2001...
journal_title:Memorias do Instituto Oswaldo Cruz
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abstract::In Brazil, until 2004, the immunization policy against diphtheria involved childhood vaccination with no official routine booster dose administered after 15 years of age. This study assessed functional antibody levels against diphtheria among blood donors. A total of 140 blood samples were collected, and diphtheria an...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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abstract::The direct agglutination test (DAT) based on a freeze-dried antigen and the rK39 dipstick test were evaluated for the sero-diagnosis of visceral leishmaniasis (VL). The sensitivity and specificity of both tests were determined using sera from confirmed VL patients (n = 21), healthy controls (n = 19) and from patients ...
journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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journal_title:Memorias do Instituto Oswaldo Cruz
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abstract::To compare the epidemiological profile and socioeconomic factors associated to the infection by Schistosoma mansoni in a rural and an urban endemic area a cross-sectional study was performed in Agua Branca de Minas (rural area) and Bela Fama (urban area), both situated in the State of Minas Gerais, Brazil. Two hundred...
journal_title:Memorias do Instituto Oswaldo Cruz
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