for, in the environment outside the hospital in the winter there is no snow there are large quantities of 1000 CFU/m3 or may be up to 100,000 CFU/m3 for indoor air filter system using a minimum of 1 to 3 were found in the quantity of detected outside of the building if there is a high-performance filter system will be found in volume 1, and less than 10 of the total number of building exterior (Isenberg, 2007).
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