4. Discussion
Our study revealed that two identified species including Blattella germanica and Periplaneta Americana were the main active cockroaches in the studied hospitals. This result is in consistent with those of vahabi et al. carried out in two hospitals of Sanandaj city, west of Iran, indicated two cockroaches’ specimens including Periplaneta Americana (44.4%) and Blattella germanica (55.6%)[3]. Furthermore, Zarchi et al. in a study done in three hospitals of Tehran city, reported the three species composition involving Periplaneta Americana (65.6%), Blattella germanica (12.1%), Blatta orientalis (22.3%)[10]. According to these researches and other similar studies in different parts of Iran, it seems that two species, Blattella germanica and Periplaneta Americana, are the predominant cockroaches in Iranian hospitals[10]. Also, in a research conducted by Pai HH et al. in selected hospitals in China, they reported Periplaneta Americana and Blattella germanica as the most common species, respectively[11]. Our investigation showed that the maximum numbers of collected cockroaches belonged to the cook house (kitchen) followed by Urology ward next. Also, this study shows that German cockroaches were the leading species in nine sites of the hospitals. These results are similar to those of Gliniewicz et al. They identified Blattella germanica in 70% of Poland hospitals, more in the kitchen, clothes storage, and in the elevator.