The majority of nosocomial infections, or those acquired in a health-care setting, are caused by which of the following:

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Studies have shown that the majority of nosocomial infections are caused by personnel not following established infection control procedures, such as hand washing and use of personal protective equipment. Other factors like contaminated surgical instruments and blood transfusions can also contribute to nosocomial infections, but personnel behavior is the most significant contributing factor. Radiation from radiology procedures is not a usual cause of nosocomial infections.

The Majority of Nosocomial Infections, or Those Acquired in a Health-Care