Studies have detected no signs that the virus has mutated to a more virulent or lethal form.
All of a sudden, a lot of well-maintained old cars, especially sportier models, have begun to fail in surprising numbers-as if struck down by some virulent new disease.
Then we knew that this was to be expected too; as if that quality of her father which had thwarted her woman's life so many times had been too virulent and too furious to die.
If that evolution makes the virus more virulent, so much the worse for the host.
Having sequenced the new strain's genes, the researchers recreated it in a laboratory and exposed it to pigs. The strain proved contagious but only mildly virulent.
Hermillia Villegas, a 47-year-old mother of two in Jalisco, Mexico, recently learned that she had a virulent form of breast cancer that responded well to treatment with Herceptin.
Like any virulent conspiracy theory, that of Obama's birth has proved immune to the intervention of fact.
The authors argue the version of the disease that caused the medieval plague is likely extinct, but suggest that further study could reveal how it may have evolved into a less virulent strain.
These viruses are among the most virulent pathogens known to infect humans.
One in five lung cancer sufferers have a particularly virulent strain called small cell lung cancer which kills all but three per cent of sufferers within five years of diagnoses.
Avian flu is not only particularly virulent; italso has the rare capacity to cross barriers between species. But it is hard totransmit.
Their severity typically reflects the level of development: the more squalid a country, the more virulent the cholera.
This is especially the case having just been through the brunt of a financial crisis that is likely to be judged the most virulent ever.
Lung cancer can also exist for years, hardly creating symptoms until its most virulent stage.
It remains to be seen whether the virus will mutate into a more virulent strain.
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