- the relative ability of a microorganism to cause disease; degree of pathogenicity.
- the capability of a microorganism to cause disease.
Examples from the Web for virulence
And, if anything, it is all the more urgent as Islamic extremism appears to be increasing in size and virulence.NYPD Will Continue Spying in the Muslim Community With Undercovers, Informants|Michael Daly|April 16, 2014|DAILY BEAST
He said, 'You can have no conception of what the virulence is against Peel and me.'
Tubercle bacilli vary widely in their virulence, and they are more tenacious of life than the common pyogenic bacteria.Manual of Surgery|Alexis Thomson and Alexander Miles
The first are frequently actuated by personal friendship, the last by all the virulence of party spirit.Table-Talk|William Hazlitt
I drew my sword, and threatened him but he was insensible to his danger; he reviled me, he spat at me with a child's virulence.Confessions of a Thug|Philip Meadows Taylor
Its virulence and difficulty of cure induced the Romans to send to Egypt for attendance.Curiosities of Medical Experience|J. G. (John Gideon) Millingen