Table 1. Survival of mice immunized or infected with CVS-F3 prior to infection with CVS-N2c.

Initial Infection or Immunization	Secondary Infection (Delay in Days)	Survival (Percent)
None	CVS-N2c	0/5 (0)
CVS-F3, live	none	5/5 (100)
CVS-F3, live	CVS-N2 c (3)	4/5 (80)
CVS-F3, live	CVS-N2c (5)	5/5 (100)
CVS-F3, inactivated	CVS-N2c (3)	0/5 (0)
CVS-F3, inactivated	CVS-N2c (5)	0/5 (0)
CVS-F3, inactivated	CVS-N2c (21)	10/10 (100)
CVS-F3, live and inactivated	CVS-N2c (3)	3/5 (60)
CVS-F3, live and inactivated	CVS-N2c (5)	5/5 (100)