Viral diseases: Introduction. A viral infection is any type of illness or disease caused by a virus, a type of microbe. Microbes are tiny organisms that cannot be seen without a microscope and include bacteria, fungi, and some parasites, as well as viruses.iral diseases: Introduction. A viral infection is any type of illness or disease caused by a virus, a type of microbe. Microbes are tiny organisms that cannot be seen without a microscope and include bacteria, fungi, and some parasites, as well as viruses.
OPTAR stands for Operating/Operational Target. Operating Targets. Operations, Planning, Training and Resource Support Services. Oceanside Photo & Telescope Astronomical Society (San Diego County, CA) Operational Tasking. Operational Tasking Data Link. Operational Tasking Nuclear. Occasional Papers in Translation and Textlinguistics.
For other uses, see istar (disambiguation) . ISTAR stands for information, surveillance, target acquisition, and reconnaissance. In its macroscopic sense, ISTAR is a practice that links several battlefield functions together to assist a combat force in employing its sensors and managing the information they gather.Information is collected on the battlefield through systematic observation by deployed soldiers and a variety of electronic sensors.Surveillance, target acquisition and reconnaissance are methods of obtaining this information.nformation is collected on the battlefield through systematic observation by deployed soldiers and a variety of electronic sensors. Surveillance, target acquisition and reconnaissance are methods of obtaining this information.