Shahla Shadzi1, Behrooz Ataei2, Zary Nokhodian1, Dana Daneshmand3. 1. Infectious Diseases and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran. 2. Acquired Immunodeficiency Research Center, Isfahan University of Medical Sciences, Isfahan, Iran. 3. Nosocomial Infection Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.