Table 2.

Generation of memory B-cell response by anti-idiotypic B cells as detected by measuring the amount of secreted antibody¹

Antigen used for booster immunization	Antibody titre (× 103)2
H protein	> 16
Anti-idiotypic B cells	> 64
Idiotypic B cells	32
Irrelevant B cells	< 2
None	< 2

¹Dilutions of sera collected from mice (as mentioned in legend of Fig. 6) were reacted with antigen (200 μ g/well of H protein).

²Data shown as titre are from the average optical density of triplicate wells normalized with readings for pre-immune sera.