Resuspension of particles relevant as viruses can remain viable for extended periods

ebolaSuspension and shedding require persistent cleaning. Viruses can hang around and be viable even three hours after being generated, making resuspension of particles a matter of concern. Droplets from sneezes might travel farther than the Center for Disease Control has suggested, too. Below are some studies that detail some of this.

Comparison of the Aerosol Stability of 2 Strains of Zaire ebolavirus From the 1976 and 2013 Outbreaks is a study that shows “the viability of 2 Zaire ebolavirus strains within aerosols at 22°C and 80% relative humidity over time. The results presented here indicate that there is no difference in virus stability between the 2 strains and that viable virus can be recovered from an aerosol 180 minutes after it is generated.” Think about this in the context that all particles can be aerosolized, and the new study from MIT that films droplets moving 6-8 meters vs. the CDC droplet precaution of three feet.

An evaluation of the impact of flooring types on exposures to fine and coarse particles within the residential micro-environment using CONTAM notes that flooring type significantly impacts the extent to which particulate matter (PM) exposures are elevated indoors from particle resuspension. Hardwood floors were identified as the most effective flooring type for the reduction of (daily, 24-h) incremental time-averaged exposure to either fine or coarse particles due to resuspension while walking.

Surrounded by a Cloud of Dust: Particle Resuspension in Indoor Environments is an informative YouTube piece presented by Brandon E. Boor, Ph.D. Assistant Professor of Civil Engineering, Purdue University at a gathering of the National Academy of Sciences, Engineering and Medicine.

Also: RESUSPENSION OF ALLERGEN-CONTAINING PARTICLES UNDER MECHANICAL AND AERODYNAMIC FORCES FROM HUMAN WALKING – INTRODUCTION TO AN EXPERIMENTAL CONTROLLED METHODOLOGY