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Virulence
Virulence The measure of how many organisms, or how much exposure to an organism, is required to cause disease. For instance Shigella can be caused by as little as a few bacteria, while E. Coli can require millions of bacteria to cause problems. RELATED TERMS-------------------------------------- Organism A living thing, such as an animal, a plant, a bacterium, or a fungus. Disease Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the rubella (German measles) virus. Bacteria Single-celled microorganisms which can exist either as independent (free-living) organisms or as parasites (dependent upon another organism for life). SIMILAR TERMS-------------------------------------- Virus Ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein. PREVIOUS AND NEXT TERMS-------------------------------------- Ventromedial nucleus of the hypothalamus Bilaterally, in the ventral (frontal) part of the middle (tuberal) region of the hypothalamus, a group of nerve cells associated with several vital functions such as food intake and sexual behavior. Vestibule That portion of the vulva which is bounded anteriorly by the clitoral glans and prepuce (clitoral hood), posteriorly by the perineum, and laterally by the exterior margins of the labia minora, and containing the opening anteriorly of the urethral meatus and posteriorly of the introitus of the vagina. VlP Vasoactive intestinal polypeptide: a peptide hormone first isolated from the small intestine and subsequently found to have many physiological roles, one of which pertains to arousal of the sex organs, including erection of the penis. Vulva The external female genitalia. Valium An anti-siezure/sedative member of the benzodiazopene family of drugs. This drug is the first choice in rapid siezure termination. Virulence Varicocele Dilated veins in the spermatic cord above or around the testis that can cause decreased sperm production on the affected side. Varicose veins Swollen, distended veins especially visible in the legs. Vasodilation Causing the widening or opening (dilation) of blood vessels. Vector An animal that spreads an infectious agent from one host to another. Also called a carrier. Venom A toxin secreted by an animal. We thank you for using the Medical Glossary to search for Virulence. If you have a better definition for Virulence than the one presented here, please let us know by making use of the suggest a term option. This definition of Virulence may be disputed by other professionals. Our attempt is to provide easy definitions on Virulence and any other medical topic for the public at large.
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