TABLE 1.

Survival of immunized channel catfish following challenge

Vaccinea	No. of fish challengedb/no. of fish that survived	% Survival	MDDc	25% MDDd	75% MDDe
i-antigen	50/36	72.0	17	14	20
Live theronts	49/29	59.2	12	10	18
14-kDa protein	50/0	0	13	12	15
BSA	40/0	0	9	8	10

^aChannel catfish were injected with protein antigens or live theronts as described in Materials and Methods.

^bEach fish was exposed to 15,000 theronts by surface exposure.

^cMDDs were calculated by Kruskal-Wallis one way ANOVA on ranks. There is a significant difference in the MDDs among the treatment groups (P < 0.01).

^dLower quartile.

^eUpper quartile.