Contamination by bacteria and viruses can occur on several levels. In the setting of the laboratory, the growth media, tissues and other preparations used for experimentation can support the growth of unintended and unwanted microorganisms. Their...

A measure of the power of a PATHOGENIC micro-organism to cause disease. Virulence can also be used variously as an expression of the severity of the symptoms, the speed of spread of the infection or a measure of the ATTACK RATE of a particular...

Those characteristics of a pathogenic micro-organism that enable or give it the potential to cause...

Virulence refers to the degree of pathogenicity of a microbe, or in other words the relative ability of a microbe to cause disease. The word virulent, which is the adjective for virulence, derives from the Latin word virulentus, which means "full of...

Throw Indian and American soldiers into a barren Afghanistan desert, toss a nuclear warhead into the hands of terrorists and you have an action-packed plot in the latest graphic novel to be released by Virgin Comics.Created by graphic artists in the southern Indian city of...

Health authorities confirmed Friday that a Lao woman who died earlier this month with symptoms of bird flu had contracted the virulent H5N1 subtype of the virus.Tests carried out by a World Health Organization Reference Laboratory in Tokyo confirmed that the woman, who died on...

The Atlanta lawyer quarantined with a dangerous strain of tuberculosis could soon be allowed to make escorted trips outside his room if a crucial test finds him no danger to others.Andrew Speaker has had two negative tests for the bacteria in his sputum, a mixture...

The Atlanta lawyer quarantined at a Denver hospital with a dangerous strain of tuberculosis could soon be allowed to make escorted trips outside his room if a crucial test finds him posing no danger to others.Andrew Speaker has had two negative tests for the bacteria...