European Norms (EN)
Methods for determining the efficacy of disinfectants in accordance with European standards, including DIN EN 1500 and DIN EN 12791. These standards provide practical methods for testing bactericidal activity.
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Airborne droplet nuclei develop when the fluid of pathogenic droplets (1-5 µm in size; micrometre = one-thousandth of a millimetre) evaporates. They are so small and light they may remain suspended in the air for several hours. Thus, they may also infect persons entering a room which has been left by a patient long ago. Also, airborne droplet nuclei can be widely dispersed by air currents. Tuberculosis, chickenpox, measles and possibly also influenza may be transmitted this way.
