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Volume 18, Number 4—April 2012


Vector Blood Meals and Chagas Disease Transmission Potential, United States

Lori StevensComments to Author , Patricia L. Dorn, Julia Hobson, Nicholas M. de la Rua, David E. Lucero, John H. Klotz, Justin O. Schmidt, and Stephen A. Klotz
Author affiliations: University of Vermont, Burlington, Vermont, USA (L. Stevens, J. Hobson, N.M. de la Rua, D.E. Lucero); Loyola University, New Orleans, Louisiana, USA (P. L. Dorn); Southwestern Biological Institute, Tucson, Arizona, USA (J.O. Schmidt); University of California, Riverside, California, USA (J.H. Klotz); University of Arizona, Tucson (S.A. Klotz)

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Table 1

Blood meal sources of Trypanosoma cruzi insect vectors collected in Arizona and California, USA, 2007 and 2009, as determined by using cytB and 12S rDNA assays, and haplotypes identified*

Assay and
Triatoma spp. T. cruzi Location† No. vertebrate blood meal sources
Haplotypes (no.) of vertebrate blood meal sources amplified in clones
No. non–blood meal clones
Clones Taxa Haplo Human Rat Chick Dog Pig Mouse‡ Vector§ ND
T. rubida R 8 1 1 A 6 1
T. rubida R 10 1 2 B, C 7 1
T. protracta E 8 1 1 D 5 2
T. protracta E 11 1 1 A 9 1
T. protracta + E 9 0 0 7 1
T. protracta + E 8 1 2 A, B 6
T. protracta E 9 0 0 9
T. protracta E 8 0 0 7 1
T. protracta + E 8 0 0 8
T. recurva 8 A (7), B
12S rRNA
T. protracta + M 8 1 2 A (7), B
T. protracta + M 8 2 4 A (4) A (2), B, C
T. rubida M 6 2 3 A (4), B A
T. rubida M 7 2 2 A A (6)

*Vector species, T. cruzi infection status, collection location, number of clones sequenced, number and identity of taxa, and number of haplotypes represented in the clone sequences are indicated. Blank cells indicate clones were not found. For the cytB assay, the number of clones that were Triatoma spp. vector DNA or had uninterpretable sequences are indicated. The mouse-fed control (cytB assay) had 2 mouse haplotypes. Haplo, haplotypes; rat, woodrat; chick, chicken; ND, not determined because of low quality sequence data; –, negative; +, positive.
†Insects were collected by using light traps at Redington Road, Tucson, Arizona (R), and Escondido, CA (E), in 2007, and within the Arizona-Sonora Desert Museum, Tucson, AZ (M), in 2009. The light traps were in “wilderness” (museum) and “sylvatic” (Redington Road and Escondido) habitats and not in human habitations.
§Triatoma spp.

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