Trypanosoma check for this species in other resources infection rate - Triatoma dimidiata check for this species in other resources - Triatoma nitida check for this species in other resources - Rhodnius prolixus check for this species in other resources - vectors' sex ratio - Guatemala"/>
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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 98, No. 3, 2003, pp. 305-310
Bioline Code: oc03073
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 98, No. 3, 2003, pp. 305-310

 en Epidemiology of Chagas Disease in Guatemala: Infection Rate of Triatoma dimidiata check for this species in other resources , Triatoma nitida check for this species in other resources and Rhodnius prolixus check for this species in other resources (Hemiptera, Reduviidae) with Trypanosoma cruzi check for this species in other resources and Trypanosoma rangeli check for this species in other resources (Kinetoplastida, Trypanosomatidae)
Carlota Monroy; Antonieta Rodas; Mildred Mejía; Regina Rosales & Yuichiro Tabaru

Abstract

A five-year domiciliary collection in the 22 departments of Guatemala showed that out of 4,128 triatomines collected, 1,675 were Triatoma dimidiata check for this species in other resources (Latreille, 1811), 2,344 were Rhodnius prolixus check for this species in other resources Stal 1859, and only 109 were T. nitida Usinger 1939. The Chagas disease parasite, Trypanosoma cruzi check for this species in other resources , was found in all three species. Their natural infection rates were similar in the first two species (20.6%; 19.1%) and slightly lower in T. nitida (13.8%). However there was no significant difference in the infection rates in the three species (p = 0.131). T. dimidiata males have higher infection rates than females (p = 0.030), whereas for R. prolixus there is no difference in infection rates between males and females (p = 0.114).

The sex ratios for all three species were significantly skewed. More males than females were found inside houses for T. dimidiata (p < 0.0001) and T. nitida (p = 0.011); a different pattern was seen for R. prolixus (p = 0.037) where more females were found. Sex ratio is proposed as an index to show the mobility of T. dimidiata in different populations.

T. dimidiata is widely distributed in the country, and is also the main vector in at least ten departments, but R. prolixus with higher vectorial capacity is an important vector in at least two departments.

Keywords
Trypanosoma check for this species in other resources infection rate - Triatoma dimidiata check for this species in other resources - Triatoma nitida check for this species in other resources - Rhodnius prolixus check for this species in other resources - vectors' sex ratio - Guatemala

 
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