Abstract
Background and Aims: Due to a wide variety of causes, various bacteria can acquire resistance to antibiotics. This study investigated the antibiotic susceptibility patterns of the etiologic bacterial agents of various infections in patients referred to three hospitals in Yazd city, Iran.
 Materials and Methods: A total of 336 clinical specimens including wound discharge, sputum, blood, bronchial fluid, pleural fluid, ascitic fluid, synovial fluid, stool, and trachea secretions were collected in three hospitals. Microbiological culturing in order to grow and identify the causative bacteria were performed. Antibiotic susceptibility determinations were done by the Kirby Bauer disk diffusion method.
 Result: Among all organisms isolated, Escherchia coli, Staphylococcus. aureus, Staphylococcus. suprophyticus, Acinetobacter spp., Pseudomonas spp., Klebsiella spp., Staphylococcus. epidermidis and Entrococcus spp. were the most prevalent, respectively. The Escherchia coli isolates were the most antibiotic-resistant Gram-negative bacterium. It seems that the same organisms recovered from different hospital wards show different antibiotic susceptibility patterns.
 Conclusion: The increased prevalence of resistant organisms in different hospitals may reflect a lack of proper antibiotic usage policy, resulting in the prolonged and indiscriminate use of antimicrobial agents.
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