Evaluation of the risk for infection via three transmission routes using droplet deposition and tracer gas from a cough machine

Maho Ichikawa, Miki Iijima, Masayuki Ogata, Hitomi Tsutsumi, Shin Ichi Tanabe, Satoshi Hori

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The three routes of infectious disease transmission include airborne, contact, and droplet infection. It is necessary to evaluate the impact of each infection route under the same conditions, to more precisely determine infection risks. In the present study, we conducted a series of experiments to evaluate the integrated risk of infection through the various infection routes. In the droplet deposition experiment, the number of droplets deposited on membranes and environmental surfaces were measured using water-sensitive paper. The relative humidity (RH) was varied to assess its effect on droplets. In a droplet nuclei experiment, carbon dioxide gas was used as a tracer. On the basis of these results, the exposure impacts of each infection route were compared under the same RH conditions. The number of droplets deposited on eyes at 30% RH was about 20% lower than the number at 50% RH. The interrelationship between the various infection routes must be considered when developing programs to prevent infection.

Original languageEnglish
Title of host publicationHealthy Buildings Europe 2017
PublisherInternational Society of Indoor Air Quality and Climate
ISBN (Print)9788379472604
Publication statusPublished - 2017
EventHealthy Buildings Europe 2017, HB 2017 - Lublin, Poland
Duration: 2017 Jul 22017 Jul 5

Publication series

NameHealthy Buildings Europe 2017

Other

OtherHealthy Buildings Europe 2017, HB 2017
CountryPoland
CityLublin
Period17/7/217/7/5

Keywords

  • Cough
  • Droplet
  • Droplet nuclei
  • Infection control
  • Infection risk
  • Relative humidity
  • Water-sensitive paper

ASJC Scopus subject areas

  • Civil and Structural Engineering

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