TABLE 2.

Serum antibody responses^a

Animal no.	Status	IgM	IgG
424	Control	0.141	0.021
423	Control	0.115	0.092
477	Control	ND	ND
Mean	Control	0.128	0.057
SEM	Control	0.013	0.036
10	Infected	0.247	0.141
1072	Infected	0.088	0.034
323	Infected	0.161	0.537
107	Infected	0.394	0.051
167	Infected	0.201	0.590
5247	Infected	ND	ND
Mean	Infected	0.218	0.271
SEM	Infected	0.051	0.121

^aData represent optical density readings of ELISA (see Materials and Methods) for serum antibody from individual animals. The group means ± SEM are presented in bold face. Serum was diluted 1:400. ND, not determined.