 Studies on raccoons in the Southeast have yielded infection rates ranging from 47 % to as low as 15 @.@ 5 % . <unk> prevalence studies have been described in Louisiana , and range from a low of 1 @.@ 1 % to 28 @.@ 8 % . Additionally , small rodents , including squirrels , mice , and rats , are important in the sylvatic transmission cycle because of their importance as <unk> sources for the insect vectors . A Texas study revealed 17 @.@ 3 % percent T. cruzi prevalence in 75 specimens representing four separate small <unk> species . 
