You'd have to know how you would define a level 3 pathogen. What's the definition? A level 2 pathogen in the wrong host is going to cause a disease more severe than a level 3 pathogen. So somebody who has C. difficile colitis is at much greater risk of dying than somebody who has tuberculosis. It's how you define a level 3 pathogen.
On March 10th, 2009. See this statement in context.