Fig. 3.

Antibody isotypes produced against Ascaris suum body extract (Asc) by ovalbumin (OvA) + PI or OvA + PIII-immunized or normal DBA/2 mice. Isotype levels in immune plasma obtained after 9 days of immunization or normal plasma (control) were titrated by ELISA using monospecific antisera. The results are expressed as the mean of five to six samples/group (+ s.e.m.), in 1:128 (IgG1), 1:256 (IgG2a), or 1:16 (IgE) dilution. Upper right: IgE antibody titres obtained by passive cutaneous anaphylactic (PCA) reaction in pools of plasma from OvA + PI- or OvA + PIII-immunized mice. *P < 0.05 compared with PI-immunized group. OD, Optical density.