“…Res. 7 (10), 1262-1269 1263 The National Nosocomial Infections Surveillance (NNIS) defines NI as "a localized or systemic condition that results from adverse reaction to the presence of an infectious agent(s) or its toxin(s) and that was not present or incubating at the time of admission to the hospital". (5) The common definition of HAI is "the infection acquiring during hospital care and not present or incubating at time of admission, it occurs within 48 hours after hospitalization, or after 3 days from discharging, or 30 days from an operation".…”