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The air in buildings often contains health menacing bacteria and viruses. To reduce disease transmission, the air can be disinfected in three ways: dilution, filtration, and purification by ultraviolet germicidal irradiation (UVGI) or UV-C. These approaches are applicable for controlling colds, flu, measles, and bioterror...

Health-care-associated infections, also known as hospital-acquired infections (HAIs) and nosocomial infections, kill more people than AIDS, breast cancer and automobile accidents combined. What’s more, according to the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO), antibiotic-resistant infections are on the...