You probably mean "virulence", not "virility". The latter word denotes the masculine ability to procreate. The confusion arises because the Latin word "vir" m

You probably mean "virulence", not "virility". The latter word denotes the masculine ability to procreate. The confusion arises because the Latin word "vir" means "man" (specifically of male sex, as opposed to human), and the similar word "virus" means poison.