Evaluation of infection risk by coughed air in a medical examination room: Part 1. Measurement of infection risk using tracer gas

Shin Ichi Tanabe, Takashi Ito, Toshiki Isahaya, Hitomi Tsutsumi, Nobuhiro Hirasuga, Hitomi Takeuchi, Motohiko Iwase, Satoshi Hori, Shoichi Morimoto, Takao Ariga

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The objective of this research is to evaluate the infection risk by the aerosol dispersion due to human cough in a medical examination room. The experiments were conducted in a full-scale test room simulated as a medical examination room. Two types of manikins were employed. One was a "Coughing Manikin," which could simulate human cough airflow using carbon dioxide (CO2) as a tracer gas. The other was a "Thermal Manikin," which was used as a medical doctor. The thermoregulation and the breathing operation of this manikin were controlled. Seventeen conditions were examined by varying the manikin positions, airflow patterns using a push-pull ventilation system (PPVS), and other conditions. Fo r the evaluation of the infection risk, both CO2 concentration in Thermal Manikin's breathing area and the capture efficiency of CO2 were used. The capture efficiency was defined as the ratio of the amount of PPVS-collected CO2 within two minutes to the total amount of CO2 that was exchanged by Coughing Manikin. It was concluded that the PPVS influenced the decrease in the infection risk depending on the CO2 concentration and the capture efficiency. Further, it was revealed that the PPVS arrangement is an important concern.

Original languageEnglish
JournalIAQ Conference
Publication statusPublished - 2011 Dec 1
EventAirborne Infection Control - Ventilation, IAQ, and Energy Conference, IAQ 2010 - Kuala Lumpur, Malaysia
Duration: 2010 Nov 102010 Nov 12

ASJC Scopus subject areas

  • Building and Construction
  • Environmental Engineering
  • Public Health, Environmental and Occupational Health

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