Figure. Types of blood meals found by using cytB and 12S assays in insect vector species that carry Trypanosoma cruzi, the pathogen that causes Chagas disease, Arizona and California, USA, 2007 and 2009. Circle size is proportional to the sample size for that comparison. A) Vertebrate taxa and vector DNA (n = 71 sequences), showing that the cytB assay amplified vector DNA more often than blood meal DNA. B) Four vertebrate taxa among the blood meals detected by the cytB assay (n = 7 sequences). Unique haplotypes (DNA sequences or alleles) of human and woodrat are indicated by letters. C) Two mouse haplotypes detected in the mouse-fed control insect (n = 8 sequences). D) Types of blood meal based on the 12S assay (n = 29 sequences).