Any hospital infection (nosocomial infection) caused by micro organisms represents a serious health threat, regardless if symptoms of illness exist or not.
Significant studies in Great Britain, Germany and the USA have shown that approx. 5 – 12% of patients contract an infection during their hospital stay. The chance to die during the hospital stay is at least three times if a nosocomial infection is present than without such infection. The studies show that the percentage of di8agnosis nosocomial infection or even cause of death was found in about 20% of the cases investigated. Nosocomial infections are responsible for significant portion of public financial burden, specifically for the health care systems.