The cleaning efficacy of the inside of the hood was tested using an aerosolized cultured influenza virus tracer and an optimal airflow rate was determined according to the test results. Furthermore, the possibility that the hood can be converted to a positive pressure hood as a clean hood by switching the airflow direction of FFU was assessed. Methods: The negative pressure hood was newly applied in an intensive care unit (ICU) as a place where a staff performs the practice of suctioning that generates much aerosol from the patient, as well as a waiting space for patients. The outside area is kept clean which decreases the risk of nosocomial infections in hospital wards. The negative pressure inside the hood is generated by a fan-filter-unit (FFU) through which infectious aerosols from a patient are filtered. Policy of Dealing with Allegations of Research Misconductīackground: We previously reported that we developed a compact and portable isolation hood that covers the top half of a patient sitting or lying in bed.
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