Virulence

Virulence factor
Any gene product which enhances the ability of an organism to cause disease.
Virulence gene
Slang for a gene encoding a virulence factor.
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virulence Degree of pathogenicity of an agent; how much damage the agent can cause.
virus A submicroscopic noncellular particle composed of a nucleoprotein core and a protein shell; parasitic; will grow and reproduce in a host cell.
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virulence. The relative infectiousness of a bacteria or virus, or its ability to overcome the resistance of the host metabolism.
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Virulence: Ability to infect or cause disease.
Virus: A noncellular biological entity that can reproduce only within a host cell. Viruses consist of nucleic acid covered by protein; some animal viruses are also surrounded by membrane.
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Bacterial virulence factors are often encoded in extrachromosomal plasmids, phages, and transposons that can be transmitted horizontally between different species or strains. Pathogenic Vibrio cholera, for example, carries a phage kappa.
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Increasing virulence
In July 2004 researchers, headed by H. Deng of the Harbin Veterinary Research Institute , Harbin, China and Professor Robert Webster of the St Jude Children's Research Hospital , Memphis, Tennessee, ...
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The relationship between virulence and transmission is complex, and has important consequences for the long term evolution of a pathogen. If a disease is rapidly fatal, the host may die before the microbe can get passed along to another host.
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Some bacteriophages contribute to the virulence of bacterial infections. Certain phages can enter an alternate life cycle called lysogeny. In this cycle, all the virus's DNA becomes integrated into the genome of the host bacterium.
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The speed with which parasites like bacteria and viruses can change their virulence may provide the strongest need for their hosts to have the ability to make new gene combinations.
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th's experiments with strains of pneumonia bacterium, the process by which hereditary information passed from dead cells of one strain into cells of another strain, causing them to take on the characteristic virulence of the ?rst strain.
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(See Satellite RNA.) Virulence. The degree of ability of an organism to cause disease. Virus. An infectious particle composed of a protein capsule and a nucleic acid core, which is dependent on a host organism for replication.
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