A system and method for collecting images of monitored devices, such as utility meters for electricity, gas and water, captures a digital image of a monitored device and produces a difference digital image from the digital image using a reference digital image of the monitored device. In particular, defective adenoviruses having a genome that includes a first recombinant DNA containing a therapeutic gene and a second recombinant DNA containing an immunoprotective gene, are disclosed. The LGP includes a light-incident surface, a light-reflecting surface and a light-emitting surface. A method also or alternatively involves changing a position of a fluid routing switch within the shaft. The method also includes receiving a character that was entered into the keyboard by a user and comparing the character to the first character in the keyword.