Virulence difference between the prototypic Schu S4 strain (A1a) and Francisella tularensisA1a, A1b, A2 and type B strains in a murine model of infection

Table 1 Probability of A1a, A1b, A2 and type B infected mice reaching drop point before Schu S ₄ infected mice

Event	Probability	Lower 95% CI^a	Upper 95% CI
A1a versus Schu S₄	0.99	0.95	1.00
A1b versus Schu S₄	0.99	0.86	0.99
A2 versus Schu S₄	0.79	0.59	0.93
Type B versus Schu S₄	0.33	0.14	0.53

ISSN: 1471-2334