Chimeric human-bovine parainfluenza viruses are infectious and attenuated in humans and other mammals and useful individually or in combination in vaccine formulations for eliciting an anti-PIV immune response or as vectors for introducing heterologous genes into a host. The protective strip is made from a wear-resistant fabric. dual layer media like a DVD or BD disc. An array of micro-lenses is in optical association with the first imaging surface, with each micro-lens in the array concentrating a first fraction of the light from the beam splitter onto concentrated image areas of the first imaging surface. , to a user, a computer file, or another EDA tool. A slide mechanism for a door and structural member assembly, the slide mechanism including a frame, a door carrier movably secured to the frame, a door and structural member such as a B-pillar at least partially supported by the door carrier, a slide mechanism that permits the B-pillar and the door to be moved along the door carrier without detaching from the vehicle frame.