High Frequency of Human Blood in Triatoma dimidiata Captured Inside Dwellings in a Rural Community in the Yucatan Peninsula, Mexico, but Low Antibody Seroprevalence and Electrocardiographic Findings Compatible with Chagas Disease in Humans

Monteón, Vı́ctor; Alducin, César; Hernández, Jorge Luis Quirós; Ramos-Ligonio, Ángel; López, Ruth

doi:10.4269/ajtmh.12-0583

Cited by 19 publications

(13 citation statements)

References 24 publications

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“…In a recently published paper it was reported that T. dimidiata in this region is preferentially infected with T. cruzi I (Monteon et al 2013). In this present work we extended our findings using multiple sequence analysis of mini-exon intergenic region of a set of five T. cruzi isolates from Yucatan peninsula and two additional geographically nonrelated Mexican strains.…”

Section: Introductionsupporting

confidence: 81%

Circulation of Tc Ia discrete type unit Trypanosoma cruzi in Yucatan Mexico

et al. 2014

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The etiologic agent Trypanosoma cruzi (Tc) has been grouped into six discrete type units (DTU I-VI); within DTU-I exists four subgroups defined Ia-Id. In Colombia, the genotype Ia is associated with human infection and domiciliated Rhodnius vector. In the Yucatan Peninsula of Mexico, the main vector involved in T. cruzi transmission is Triatoma dimidiata predominantly via sylvatic and peridomiciliated cycles. In this study, multiple sequence analysis of mini-exon intergenic regions of T. cruzi isolates obtained from T. dimidiata in the Yucatan Peninsula of Mexico revealed they belonged to Tc Ia DTU along with two additional Mexican strains located 1,570 km away from Yucatan. In conclusion Tc Ia circulates in the Yucatan peninsula in T. dimidiata vector and likewise in the northwest region of Mexico.

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Section: Introductionsupporting

confidence: 81%

Circulation of Tc Ia discrete type unit Trypanosoma cruzi in Yucatan Mexico

et al. 2014

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“…It is interesting to note that a recent article from the Yucatan reports a high incidence of Triatoma dimidiata , an important vector of Chagas disease in Central America, feeding on humans but a very low incidence of Chagas disease. 21 …”

Section: Discussionmentioning

confidence: 99%

Free-roaming Kissing Bugs, Vectors of Chagas Disease, Feed Often on Humans in the Southwest

Klotz¹,

Schmidt²,

Dorn³

et al. 2014

The American Journal of Medicine

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BACKGROUND Kissing bugs, vectors of Trypanosoma cruzi, the parasite that causes Chagas disease, are common in the desert Southwest. After a dispersal flight in summer, adult kissing bugs occasionally gain access to houses where they remain feeding on humans and pets. How often wild, free-roaming kissing bugs feed on humans outside their homes has not been studied. This is important because contact of kissing bugs with humans is one means of gauging the risk for acquisition of Chagas disease. METHODS We captured kissing bugs in a zoological park near Tucson, Arizona, where many potential vertebrate hosts are on display, as well as being visited by more than 300,000 humans annually. Cloacal contents of the bugs were investigated for sources of blood meals and infection with T. cruzi. RESULTS Eight of 134 captured bugs were randomly selected and investigated. All 8 (100%) had human blood in their cloacae, and 7 of 8 (88%) had fed on various vertebrates on display or feral in the park. Three bugs (38%) were infected with T. cruzi. Three specimens of the largest species of kissing bug in the United States (Triatoma recurva) were captured in a cave and walking on a road; 2 of 3 (67%) had fed on humans. No T. recurva harbored T. cruzi. CONCLUSIONS This study establishes that free-roaming kissing bugs, given the opportunity, frequently feed on humans outside the confines of their homes in the desert Southwest and that some harbored T. cruzi. This could represent a hitherto unrecognized potential for transmission of Chagas disease in the United States.

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“…Between 17% and 33% of domestic and periurbanmammal species have been reported infected with T. cruzi in the YP (Zavala-Velazquez et al,1996;Ruiz-Piña and Cruz-Reyes, 2002;Jimenez-Coello et al, 2008;Rebollar-Tellez et al, 2009). Livestock and pets also have similar infection prevalence between 5% and 34% (Hernandez et al, 2010;JimenezCoello et al, 2010;2012a;2012b;Monteón et al, 2013;Carrillo-Peraza et al, 2014). The human population in the YP has a heterogeneousT.…”

Section: Introductionmentioning

confidence: 86%

“…Several studies have now reported extension of natural distributions and sympatry for all three haplogroups, h1 and h2 have both been found in the Yucatan Peninsula (YP) (Bargues et al, 2008;Dorn et al, 2009;Gómez-Palacios and Triana 2014), and h2 and h3 in northern Chiapas (Pech-May, personal communication). Triatoma dimidiata infests between 8% and 61% of houses in the YP, with colonization indices between 5% and 25% (Guzman-Marin et al, 1990;Dumonteil et al, 2002;Hernández et al, 2010;Monteón et al, 2013). Many natural hosts of the dimidiata complex from modified habitats (i.e.…”

Section: Introductionmentioning

confidence: 97%