TABLE 2.

Serum IgE production by young versus mature mice

Mouse type	Serum IgE production (μg/ml) at wka:
	0	1	2	4
Young	4.2 ± 3.1	7.0 ± 2.4	29.4 ± 16.7*	69.9 ± 38.2*
Mature	2.1 ± 1.1	3.6 ± 2.7	32.3 ± 12.5†	55.7 ± 29.9†

^aTotal IgE was measured using ELISA as described in Materials and Methods. Data are expressed as means ± standard error (n ≥ 4/group/time point). *, P < 0.05 when young infected mice are compared with young uninfected mice; †, P < 0.05 when mature infected mice are compared with mature uninfected mice. Serum IgE production levels between young and mature mice were not statistically different at any time point.