Triatominae–Trypanosoma cruzi/T. rangeli: Vector–parasite interactions

Vallejo, Gustavo Adolfo; Guhl, Felipe; Schaub, Günter A.

doi:10.1016/j.actatropica.2008.10.001

Cited by 153 publications

(143 citation statements)

References 110 publications

Supporting

Mentioning

113

Contrasting

Unclassified

Order By: Relevance

“…Subsequent studies clearly showed host-parasite specific associations between T. rangeli-Rhodnius spp. and a hypothesis that these triatomines act as biological filters in the transmission of genetically distinct populations of T. rangeli (11,14,15 (11). Such association agrees with the report of a trypanolytic protein present in R. prolixus hemolymph, which selectively lyses (KP1-) strains isolated from R. pallescens, R. colombiensis and R. ecuadoriensis, but not (KP1+) strains (18).…”

supporting

confidence: 78%

“…Vallejo, et al (10), characterized two major lineages of T. rangeli in Latin America based on the presence or absence of a minicircle of kDNA (KP1+ and KP1-, respectively). T. rangeli presents an extensive genetic variability demonstrated by kDNA and nuclear DNA analysis (7,9,11,12). Moreover, analysis of the karyotype profiles permitted the division of the T. rangeli strains into two groups coinciding with the KP1+ and KP1− genotypes (13).…”

mentioning

confidence: 99%

“…Based on the current hypothesis regarding T. rangeli and Rhodnius spp. co-evolution (11,14,15), we propose that infectivity (intestinal, hemolymphatic and glandular) and the transmission of the T. rangeli strain SC-58 (characterized as KP1-) would be greater and more efficient in R. pictipes. Therefore, the goal of the present study was to analyze the susceptibility of four Rhodnius species (R. robustus, R. neglectus, R. nasutus and R. pictipes) to a Brazilian strain of T. rangeli (SC-58/KP1-).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Susceptibilidad de diferentes especies de Rhodnius (Hemiptera, Reduviidae, Triatominae) a una cepa brasileña de Trypanosoma rangeli (SC58/KP1-)

et al. 2014

View full text Add to dashboard Cite

Introduction: Specific host-parasite associations have been detected experimentally and suggest that triatomines of the genus Rhodnius act as biological filters in the transmission of Trypanosoma rangeli. Objective: To analyze the susceptibility of four Rhodnius species (Rhodnius robustus, Rhodnius neglectus, Rhodnius nasutus and Rhodnius pictipes) to a Brazilian strain of T. rangeli (SC-58/KP1-). Materials and methods:We selected thirty nymphs of each species, which were fed on blood infected with T. rangeli. Periodically, samples of feces and hemolymph were analyzed. Triatomines with T. rangeli in their hemolymph were fed on mice to check for transmission by bites. Later, the triatomines were dissected to confirm salivary gland infection. Results: Specimens of R. pictipes showed higher rates of intestinal infection compared to the other three species. Epimastigotes and trypomastigotes were detected in hemolymph of four species; however, parasitism was lower in the species of the R. robustus lineage. Rhodnius robustus and R. neglectus specimens did not transmit T. rangeli by bite; after dissection, their glands were not infected. Only one specimen of R. nasutus and two of R. pictipes transmitted the parasite by bite. The rate of salivary gland infection was 16% for R. pictipes and 4% for R. nasutus. Conclusions: Both infectivity (intestinal, hemolymphatic and glandular) and transmission of T. rangeli (SC58/KP1-) were greater and more efficient in R. pictipes. These results reinforce the hypothesis that these triatomines may act as biological filters in the transmission of T. rangeli.

show abstract

supporting

confidence: 78%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Susceptibilidad de diferentes especies de Rhodnius (Hemiptera, Reduviidae, Triatominae) a una cepa brasileña de Trypanosoma rangeli (SC58/KP1-)

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Silva 40 Outros fatores devem influenciar os padrões de defecação e a competência dessas espécies de Rhodnius na transmissão de tripanosomatídeos, entre eles a afinidade parasito-vetor e a variabilidade genética das linhagens de parasitos que podem determinar a infecção no vetor 24,43 . Nesse sentido, Martins cols 18 mostraram que R. neglectus era mais suscetível a T. cruzi que R. robustus e Carvalho-Moreira cols 21 chegaram a mesma conclusão comparando R. neglectus e T. pseudomaculata.…”

Section: Agradecimentosunclassified

Biologia comparativa e comportamento alimentar de Rhodnius neglectus e Rhodnius robustus (Triatominae) sob condições de laboratório

Barreto-Santana

Starling

Gurgel-Gonçalves

et al. 2011

Rev. Soc. Bras. Med. Trop.

View full text Add to dashboard Cite

RESUMOIntrodução: A competência vetorial de triatomíneos é determinada a partir de estudos sobre biologia e comportamento alimentar em condições de campo e/ou laboratório. Fatores como número de picadas, quantidade de sangue ingerido e tempo de defecação têm implicações na transmissão de tripanosomatídeos. Parâmetros biológicos e comportamentais de Rhodnius neglectus e R. robustus foram comparados experimentalmente para estimar diferenças no potencial de transmissão de tripanosomatídeos. Métodos: Os triatomíneos foram observados diariamente para determinar o período de desenvolvimento ninfal, mortalidade, detecção da fonte alimentar, número de picadas, tempo do repasto sanguíneo, quantidade de sangue ingerido, tempo entre o final do repasto e a primeira defecação e frequência de defecação. Resultados: Apesar do período ninfal de R. neglectus (156,4 ± 25,05d) ter sido menor que o de R. robustus (204,7 ± 13,22d), a mortalidade foi similar entre as espécies (63,8 e 65%, respectivamente). R. robustus e R. neglectus detectaram rapidamente a fonte alimentar, especialmente no primeiro estádio (2,5 e 1,6min, respectivamente). Apesar do tempo de repasto sanguíneo ter sido similar entre as espécies, R. robustus ingeriu em média uma maior quantidade de sangue em todos os estádios, com maiores valores para as ninfas V. As ninfas de R. neglectus picaram mais vezes as fontes alimentares, defecaram mais rápido e mais frequentemente que as de R. robustus. Conclusões: Sob as condições de laboratório usadas, R. neglectus possui um maior potencial para transmissão de Trypanosoma cruzi e T. rangeli que R. robustus, atributo que deve ser avaliado em infecções experimentais. Palavras-chaves: Triatominae. Rhodnius. Biologia. Competência vetorial. Tripanosomatídeos. ABSTRACT Introduction:The vector competence of triatomine insects is determined by studying their biology and feeding behavior under field and/or laboratory conditions. Factors including the number of bites, the amount of blood ingested and defecation time have implications for trypanosome transmission. The biological and behavioral parameters of Rhodnius neglectus and R. robustus were compared under experimental conditions to estimate differences in the potential transmission of trypanosomes. Methods: The insects were observed daily to determine the period of nymphal development, mortality, detection of food source, number of bites, time of blood meal intake, amount of blood ingested, time elapsed between the end of the meal and the first defecation and the frequency of defecation. Results: Although the nymphal development of R. neglectus (156.4 ± 25.05d) was lower than that of R. robustus (204.7 ± 13.22d), the mortality between species was similar (63.8 and 65% respectively). R. robustus and R. neglectus quickly located the food source, especially in the first instar (2.5 and 1.6 min, respectively). Although the time of blood meal intake was similar between the species, R. robustus ingested a larger amount of blood on average at all stages and exhibited higher values for ...

show abstract

“…Thus, the parasite affects the capacity to resist starvation but neither the developmental nor the mortality rate (Vallejo et al 2009). However, changes in the behaviour of infected bugs also occur.…”

Section: Mixturementioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

View full text Add to dashboard Cite

Triatominae–Trypanosoma cruzi/T. rangeli: Vector–parasite interactions

Cited by 153 publications

References 110 publications

Susceptibilidad de diferentes especies de Rhodnius (Hemiptera, Reduviidae, Triatominae) a una cepa brasileña de Trypanosoma rangeli (SC58/KP1-)

Susceptibilidad de diferentes especies de Rhodnius (Hemiptera, Reduviidae, Triatominae) a una cepa brasileña de Trypanosoma rangeli (SC58/KP1-)

Biologia comparativa e comportamento alimentar de Rhodnius neglectus e Rhodnius robustus (Triatominae) sob condições de laboratório

Olfaction in vector-host interactions

Contact Info

Product

Resources

About