Groups of mice were immunized i.m. in the gastrocnemious with 102–105 ffu of GASGAS or GASγ followed by i.c. challenge with 103 ffu of DRV4 13 days later. They were monitored for mortality and morbidity for 28 days post-challenge. A is a summary of the survival proportions while B shows the survival curves. An ED50 comparison of GASGAS and GASγ is shown in C. Significant difference between survival curves was determined by the Mantel-Cox test. *, p≤0.05 and denotes the difference between the GASγ curve and the GASGAS curve at the same immunization dosage. ■, 102 ffu; , 103 ffu; ♦, 104 ffu; ●, 105 ffu; ◊, non-immunized control.