What is the difference between pathogenicity and virulence?

Question

anonymous · Answer

Pathogenicity is the ability to cause a disease in host organisms, virulence is the measurement of the ability to cause a disease in host. (-:

anonymous · Answer

How does a high pathogenicity differ from high virulence?

anonymous · Answer

The virulence is the  quantitative notion of host organisms whereas pathogenicity is the qualitative notion.
for example :Shigella dysenteriae and Shigella flexneri are both responsible of dysenterie bacillaire, but not in the same quantity. Only few bacteria are needed to develop an infection with S.dysenteriae whereas several thousands are necessary with S. flexneri. So this species is consider as less virulente  than S.dysenteriae.

anonymous · Answer

So shigella dysenteriae and Shigella  flexneri have the same pathogenicy because their are responsible of the same desease but they have different virulence