In the United States US, I. affinis has been reported as vector of pathogens, such as the bacterium Borrelia burgdorferi Harrison et al., 2010, that causes Lyme disease in many species of animals.
En Estados Unidos de América EUA, I. affinis se ha manifestado como vector de patógenos, tales como Borrelia burgdorferi Harrison et al., 2010 la bacteria que causa la enfermedad de Lyme en muchas especies de animales−.