Jundishapur Journal of Microbiology (2008); 1(1): 28-31 28 __________________________________________________________________________________________ Identification of bacteria which possible transmitted by Musca domestica (Diptera: Muscidae) in the region of Ahvaz, SW Iran Babak Vazirianzadeh 1 , Setareh Shams Solary 2 , Mahmoud Rahdar. 1 Reza Hajhossien 3 , Manijeh Mehdinejad 4 1 Department of Medical Mycoparasitology, School of Medicine, and Infectious Diseases and Tropical Medicine Centre, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran 2 Department of Medical Entomology, School of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran 3 Department of Medical Mycoparasitology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran 4 Department o f Medical Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Received: June 2008 Accepted: August 2008 Abstract The house-fly, Musca domestica L., not only is a nuisance pest, but also acts as an important mechanical vector for lots of pathogenic microorganism agents, including: bacteria, protozoa, worms, fungi and viruses amongst humans and animals. The aim of this study was to isolate and identification bacteria that are pick up by house-fly over the human and animal premises. In this study totally 230 houseflies were collected to isolate their bacteria, from the central slaughter house and a zoo in Ahvaz SW Iran. The most common isolated bacteria were Escherichia coli with 230 cases (36.5%). The results of the current study confirm that flies are much more than a nuisance and that they pose potentially serious health risks. Consequently, the population of houseflies has to be controlled. Keywords: Musca domestica, Escherichia coli, Staphylococci aureus, Pseudomonas spp., Proteus spp., Ahvaz Introduction The house-fly, Musca domestica, not only is a nuisance pest, but also acts as an important mechanical vector for lots of pathogenic microorganism agents, including: bacteria, protozoa, worms, fungi and viruses amongst humans and animals. The population of houseflies transmit the disease agents by means of different parts of their bodies (hairs body, appendages and mouth parts) and secretions (regurgitates and feces). House-flies enter to the several places, including contaminated premises because of their own biologic habits for feeding [1]. The habits of house-fly favor the spread of bacteria and other disease- causing organisms [2]. Consequently, house fly, for example, can spread diseases such as food poisoning and dysentery regarding to bacteria [1, 2]. More than 100 pathogens associated with the house fly may cause diseases in humans and animals, including typhoid, cholera, bacillary dysentery, tuberculosis, anthrax,