All types of passengers are welcome on this cockroach bus. Over 30 species of bacteria have been found on the cuticle and gut of roaches, including those of serious medical import such as E. coli, various species of Salmonella and Staphylcoccous, Pseudomonas aeruginosa and Klebsiella pneumoniae (4). These bacteria cause diseases such as urinary tract infections, dysentery, diarrhea, pneumonia, cholera, polio, septicemia and wound infections (5). One study that trapped cockroaches in order to measure their bacterial load found that number was as high as 14 million microbes found on the exterior of the bodies, and 7 million in their fecal droppings (5).