author(s)
Farzad Motevali Haghi, Mohammad Ahanjan, Masoumeh Eslamifar and Khalil Akbari Mohammadi

abstract
Blow Flies are found worldwide, occurring nearly every place inhabited by human. They may transmit disease organisms to people. This study was done to isolate some of bacteria from Lucilia sericata in Sari City and determine their antibiotic susceptibility pattern. In this experimental study, totally 600 blow flies were collected from 3sites of Sari city (April–Dec 2016). Bacteria on the external surface and digestive system of each fly were identified by using standard tests based on Bergay^, s technique. Antibiotic susceptibility test was performed by disc diffusion method based on CLSI. There were 2 peaks of fly activity in a year; (Jun-July and Aug-Sep). The most common isolated bacteria were E. coli (19%) and S. aureus (15.8 %). Antibiotic resistance was found in isolated. These findings suggest a potential role of blowflies in transmission of pathogenic bacteria with antibiotic resistance. Therefore, their population should be controlled in North of Iran.