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.

Related Articles


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 January 30, 2015 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 January 30, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Friday, January 30, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Oxfam Calls for Massive Aid for Ebola-Hit West Africa

Oxfam Calls for Massive Aid for Ebola-Hit West Africa

AFP (Jan. 29, 2015) Oxfam International has called for a multi-million dollar post-Ebola "Marshall Plan", with financial support given by wealthy countries, to help Guinea, Sierra Leone and Liberia to recover. Duration: 01:10 Video provided by AFP
Powered by NewsLook.com
Are We Winning The Fight Against Ebola?

Are We Winning The Fight Against Ebola?

Newsy (Jan. 29, 2015) The World Health Organization announced the fight against Ebola has entered its second phase as the number of cases per week has steadily dropped. Video provided by Newsy
Powered by NewsLook.com
Calif. Health Officials Campaign Against E-Cigarettes

Calif. Health Officials Campaign Against E-Cigarettes

Newsy (Jan. 29, 2015) The California Health Department says e-cigarettes are a public health risk for both smokers and those who inhale e-cig smoke secondhand. Video provided by Newsy
Powered by NewsLook.com
Measles Scare Sends 66 Calif. Students Home

Measles Scare Sends 66 Calif. Students Home

AP (Jan. 29, 2015) Officials say 66 students at a Southern California high school have been told to stay home through the end of next week because they may have been exposed to measles and are not vaccinated. (Jan. 29) Video provided by AP
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:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

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