an ultramicroscopic (20 to 300 nanometers in diameter), metabolically inert, infectious agent that replicates only within the cells of living hosts, mainly bacteria, plants, and animals: composed of an RNA or DNA core, a protein coat, and, in more complex types, a surrounding envelope. A human retrovirus that has been isolated from some patients with chronic fatigue syndrome and prostate cancer. Viruses are also responsible for the common cold, childhood exanthems (such as chickenpox, measles, rubella), latent infections (such as herpes simplex), some cancers or lymphomas (such as Epstein-Barr virus), and diseases of all organ systems. A virus with reduced pathogenicity as a result of treatment or repeated passage through hosts. It is typically found in Australia and neighboring islands. Unable to replicate without a host cell, viruses are typically not considered living organisms. The 400 known viruses are classified in several ways: by genome core (RNA or DNA), host (animals, plants, or bacteria), method of reproduction (such as retrovirus), mode of transmission (such as enterovirus), and disease produced (such as hepatitis virus). He felt much better on Monday and worked half a day. A rabies virus stabilized and modified but only partially attenuated by serial passage through rabbits. The application of Latin vīrus to the submicroscopic infectious agents now considered viruses (rather than to any infectious agent) was apparently first made by the Dutch microbiologist Martinus Beijerinck (1851-1931) in "Ueber ein Contagium vivum fluidum als Ursache der Fleckenkrankheit der Tabaksblätter," Verhandelingen der Koninklijke Akademie van Wetenschappen te Amsterdam, Tweede Sectie, Deel VI, no. Disease transmission can be prevented with mosquito control and mosquito avoidance measures. In some patients, the disease can also damage major organs, as the heart or kidneys. The lipid envelope is frequently dotted by spikes. Three to five days following exposure to RSV, the patient typically develops an upper respiratory infection lasting 1 to 2 weeks with cough, mild to moderate nasal congestion, runny nose, and low-grade fever. Intestinal signs and symptoms last for 24 to 48 hr. in what ways can i get HIV? Vomiting, dehydration, and acidosis may occur. Nasopharyngeal suction may be needed to clear congestion (by bulb syringe for infants). A computer virus is a small software program that can spread from one computer system to another and cause interferences with computer operations. They are members of the Arenavirus family and are typically found in rodents. A tick-borne Flavivirus, responsible for encephalitis, primarily in mice. Some of the most virulent diseases are caused by viruses, e.g., the hemorrhagic fever caused by Ebola virus. Another word for virus. Infants and children with RSV pneumonia exhibit retractions; rapid grunting respirations, poor oxygenation, and respiratory distress. The flu was short... One of my uncle is recovering from the flu and lower back pain. a viral disease. He was completely debilitated for one entire day, laying on the floor in each room of his house. A virus causing infectious disease, so small it retains infectivity after passing through a filter of the Berkefeld type. Computer viruses never occur naturally. A Bunyavirus transmitted by insect bite, esp. The next morning, He couldn't move. A virus that causes malignant neoplasms. Because the virus does not infect animals, it is considered a safe vehicle for antigen display in humans and other species. It commonly causes nausea, vomiting, and diarrhea. Its chemical components are phospholipids and glycoproteins. Q. See: The herpesvirus that causes chickenpox and shingles. Infection is occasionally fatal. 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