The sampling protocol and analytical procedures for airborne viable microorganisms in office environments are presented. Sampling strategy is outlined. The primary objective of sampling is to identify the sources of microorganisms so that corrective action may be taken. Sampling times, culture media, sample selection, calibration, and disinfection are discussed. Steps in the handling and processing of collected samples are described. These should have the input of a microbiologist or consultant experienced in microbiological techniques. Data interpretation is considered. Recommended remedial actions in cases where the total microorganism count exceeds 10,000 per cubic meter are given. These include removing stagnant water and slime from mechanical systems in the building, eliminating water spray systems in air handling units, substituting steam for cold water in humidifiers, eliminating the use of cold mist evaporators, maintaining the relative humidity below 70 percent, replacing heating, ventilation, and air conditioning system filters at scheduled intervals, providing adequate amounts of suitable outdoor air to reduce concentrations of microorganisms that may be shed by occupants, and reassigning affected or sensitized personnel to other work environments if necessary.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.