Curtains are provided which have fastener/s and, in some cases, strut/s arranged along a screen. The strut/s extend to elevation/s below and/or above the fastener/s. An upper strut may have a lower degree of stiffness than a lower strut. In some cases, the fastener/s are arranged at least 20 inches from the screen's upper edge. Systems are described which include a disinfection apparatus and any of such curtains. Other systems include any of such curtains attached to an edge of a room divider. Easily assembled and disassembled room dividers are described which include cord/s and/or pole/s, installed or portable device/s for supporting the cords/poles, and fasteners for attaching a curtain to the cords/poles. A disinfection apparatus is described which includes a shield extending to an elevation at least two feet above a germicidal light source and borders at least one third of a continuous region surrounding the germicidal light source.