Table I.

Isotype of serum and fecal extract Igs in young adult and aged micea

SamplesAge of MiceIgM (μg/ml)IgG (μg/ml)IgA (μg/ml)
Serum6–8 wk772.0 ± 15.17383.7 ± 20.1924.4 ± 20.2
12–14 mo3101.2 ± 177.16376.0 ± 5941047.4 ± 20.8
Fecal extracts6–8 wk1.07 ± 0.010.5 ± 0.12.7 ± 0.03
12–14 mo0.95 ± 0.082.2 ± 0.122.45 ± 0.02
  • a Values represent the mean endpoint titer ± SEM for 15 mice in each experimental group.