Table 1.

Passive protection of neonatal mice with rabbit antiserum to the C protein

Strain	Antiserum	Number of pups, alive/total	% survival
A909	Anti	7/12	58
	Anti-Ia-TT*	10/10	100
	Preimmune†	2/19	10
JL2053	Anti	0/12	0
	Anti-Ia-TT	8/9	89
	Preimmune	0/18	0
JL2054	Anti	1/12	8
	Anti-Ia-TT	9/9	100
	Preimmune	3/18	17

^*Positive control 

^†Negative control.