Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 47 5 2018 05 13 713 719 Reza RANJBAR Molecular Biology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran Omid FARAHANI Dept. of Microbiology, Islamic Azad University, Varamin-Pishva Branch, Tehran, Iran 2018 05 13 2018 05 13 Background: Due to the widespread different pathogenic strains, Escherichia coli lead many severe to normal diseases worldwide. Finding the relation of clones with genomic content and clinical features is a key point to recognize the high potential-invasive strains. Specific virulence factors include adhesions, invasions, toxins, and capsule are the main determinants of pathogenic factors of E. coli strains. Methods: From Jun 2014 to Jun ‎‎2016, E. coli isolates recovered using standard bacteriological methods from wastewater sources in different hospitals in Tehran, Iran, were monitored to recognize the virulence genes by polymerase chain reaction (PCR) assay. Results: The high and low presences of virulence factors were fimH, 76% and afa, 13%, respectively. Conclusion: The results indicated the potential pathogenicity of E. coli strains circulating in hospital wastewaters in Tehran, Iran.     https://ijph.tums.ac.ir/index.php/ijph/article/view/13354 https://ijph.tums.ac.ir/index.php/ijph/article/download/13354/5979