Regional evaluation of bacterial contamination in hospital environment cockroaches
Insects have the largest variety of specimens among the entire animals, according to scientific finding, 80% of the known animal’s specimens in the world are insects. Cockroaches are of the most successful with highest history of life, which have been existed since Pennsylvanian period (beyond Carboniferous period) (Atkinson, eli at., 1991; Salehzadeh, 1992; Daly, eli at., 1998; Mohanimadi, 1998; Cochran, 2001). They always affect human’s health, they are known as one of the most important agents in transmission and distribution of many different bacteria, viruses, protozoa and fungi to human life, and they are intermediate host for some pathogenic intestinal worms (Cloarec, eli at., 1992; Kopanic, eli at., 1994). According to the results of extensive researches, cockroaches are naturally able to transmit more than 40 bacterial specimens and they can be infected by some other lab bacteria (Ash and Greenberg, 1980; Cornwell and Mendes, 1981).