Featured Research

from universities, journals, and other organizations

Methods For Counting Airborne Bacteria Inadequate, Say Researchers

Date:
August 30, 1997
Source:
American Society For Microbiology
Summary:
Current methods for detecting and counting airborne bacteria in enclosed buildings may be inadequate and understate the total number of airborne organisms, say researchers from the University of Maryland and the U.S. Environmental Protection Agency.

Current methods for detecting and counting airborne bacteria inenclosed buildings may be inadequate and understate the total number ofairborne organisms, say researchers from the University of Maryland andthe U.S. Environmental Protection Agency in the September 1997 issueof the journal Applied and Environmental Microbiology.

Indoor air pollution has become a serious concern. Newer, energyefficient buildings are usually sealed, recycling the air and increasing thenumber of bacteria in the environment. An estimated 10 to 25 millionworkers in the United States show symptoms of "sick buildingsyndrome" (SBS) annually. The role of airborne bacteria in SBS is stilllargely unknown but it is generally accepted that microorganisms areinvolved.

In the study the researchers tested the effects of aerosolization onviability and colony-forming ability on several bacterial species. Thebacteria were sprayed into glass containers and then total numbers werecounted by two different methods. The first method was the methodtraditionally employed to determine indoor air quality where the thebacteria are cultured and the colonies formed are counted. The other wasdirect staining and counting of viable bacteria. The researchers foundthat less than 10 percent of the aerosolized bacteria were capable offorming colonies.

"From these results it is concluded that the bacterial strains includedin this study did not respond to standard culture methods afteraerosolization," say the researchers. "The plate [colony] count providesan estimate of only those few cells least affected by exposure to air." (J.F. Heidelberg, M. Shahamat, M. Levin, I. Rahman, G. Stelma, C.Grim, and R.R. Colwell. 1997. Effect of aerosolization onculturability and viability of gram-negative bacteria. Applied andEnvironmental Microbiology 63:3585-3588.)


Story Source:

The above story is based on materials provided by American Society For Microbiology. Note: Materials may be edited for content and length.


Cite This Page:

American Society For Microbiology. "Methods For Counting Airborne Bacteria Inadequate, Say Researchers." ScienceDaily. ScienceDaily, 30 August 1997. <www.sciencedaily.com/releases/1997/08/970830062324.htm>.
American Society For Microbiology. (1997, August 30). Methods For Counting Airborne Bacteria Inadequate, Say Researchers. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/1997/08/970830062324.htm
American Society For Microbiology. "Methods For Counting Airborne Bacteria Inadequate, Say Researchers." ScienceDaily. www.sciencedaily.com/releases/1997/08/970830062324.htm (accessed September 22, 2014).

Share This



More Health & Medicine News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Sierra Leone in Lockdown to Control Ebola

Sierra Leone in Lockdown to Control Ebola

AP (Sep. 21, 2014) Sierra Leone residents remained in lockdown on Saturday as part of a massive effort to confine millions of people to their homes in a bid to stem the biggest Ebola outbreak in history. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Sierra Leone's Nationwide Ebola Curfew Underway

Sierra Leone's Nationwide Ebola Curfew Underway

Newsy (Sep. 20, 2014) Sierra Leone is locked down as aid workers and volunteers look for new cases of Ebola. Video provided by Newsy
Powered by NewsLook.com
Changes Found In Brain After One Dose Of Antidepressants

Changes Found In Brain After One Dose Of Antidepressants

Newsy (Sep. 19, 2014) A study suggest antidepressants can kick in much sooner than previously thought. Video provided by Newsy
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins