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Relationship between aerosol concentration and airborne microbe including porcine sapelovirus concentration in Japanese weaning swine houses

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  10th International Livestock Environment Symposium (ILES X)  .(doi:10.13031/iles.18-118)
Authors:   Takanori Naide, Atsuo Ikeguchi, MD Aminul Islam, Ken Katsuda, Kenji Kawashima, Ryoh Nakakubo, Ayako Miyazaki
Keywords:   Aerosols, Animal housing, Airborne, Bacteria

Abstract

It is important to reduce aerosol of infectious pathogens within-farm and between-farms to prevent aerosol transmission of infectious diseases. Instant measurement and control of airborne microbe concentration is desirable but real time measurement of microbe concentration is not possible. If the relationship between aerosol concentration and airborne microbe concentration is elucidated, it is possible to obtain airborne microbe concentration from aerosol concentration and to control airborne microbe concentration in real time. Therefore, the objective of this study was to elucidate relationship between aerosol concentration and airborne microbe concentration in Japanese weaning swine houses. Aerosol concentration were measured by optical particle sizer (OPS3330; TSI Inc., USA) and separate particles sizes into 5 size interval: 0.3-0.5, 0.5-1.0, 1.0-2.0, 2.0-5.0, 5.0-10.0 µm. Microbes in the air were collected using liquid cyclone air sampler (Coriolis µ; Bertin Inc., France) and detected Staphylococcus aureus, Escherichia coli and Aerobic microorganism. In addition, this study was analyzed for airborne porcine sapelovirus (PSV) genomes for detection of viral aerosols. As a result, the correlation between aerosol concentration and airborne aerobic microorganism concentration was found in the particle size: 5.0-10.0 µm. Moreover, the correlation between aerosol concentration and airborne Staphylococcus aureus concentration was found in the particle size: 2.0-10.0 µm. Airborne PSV concentration were detected up to 108 genomes per cubic meter of air. The correlation between aerosol concentration and airborne PSV concentration was not found. However, airborne PSV detection rate was high when aerosol concentration of particles size: 2.0-5.0 µm was more than 106 particles per cubic meter.

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