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Middle English from Latin vīrulentus from vīrus poison
American Heritage Dictionary of the English Language, 5th Edition
From Latin virus (“poison, slime, venom").
The worst feature was a virulent outbreak of cholera in Gujarat, especially in the native states.
When but three years old he had a virulent attack of small-pox which left his face disfigured, and contributed to his father's dislike of him.
Infection with highly virulent strains should be more straightforward.
It is a feature of viruses that with time they become less virulent.
Such drainage as had at one time existed was allowed to get choked up, giving rise to typhoid fever of a virulent type.
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