Show your support of CIRI with the 'CIRI Supporter' logo, available for display on your Web site upon joining CIRI.
Join today and help CIRI advance the cause of cleaner, more productive, and healthier indoor environments through scientific research!
Long-living Bacteria and Viruses
Some viruses and bacteria can live from 20 minutes up to 2 hours or more on surfaces like cafeteria tables, doorknobs, and desks.
Ansari, 1988; Scott and Bloomfield, 1989
By CIRI Staff
"Log reduction" is a mathematical term (as is "log increase") used to show the relative number of live microbes eliminated from a surface by disinfecting or cleaning.
For example, a "5-log reduction" means lowering the number of microorganisms by 100,000-fold, that is, if a surface has 100,000 pathogenic microbes on it, a 5-log reduction would reduce the number of microorganisms to one.
The Cleaning Industry Research Institute (CIRI) is a 501.c.3 not-for-profit scientific, educational and research organization that applies science to the practice and improvement of cleaning and maintenance.
This abstract/brief is presented under the recognized "fair use" doctrine with respect to article copyright and intellectual property. Readers are encouraged to secure the full article from the originating publication source. Articles also may be obtained through a librarian, an information specialist or inter-library loan. In cases where payment is required under copyright it can be processed through a reference library or the Copyright Clearance Center at www.copyright.com.
CIRI provides no warranty, expressed or implied, and assumes no legal liability for the accuracy, completeness or usefulness of any information disclosed on its site. The views and opinions of authors expressed herein do not necessarily reflect those of CIRI principals, executives, science advisors or affiliates.