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Hypersensitivity reactions in DBA/2 mice immunized with ovalbumin (OvA), OvA + Ascaris suum body extract (Asc), OvA + PI or OvA + PIII in Freund's complete adjuvant (FCA) and challenged 8 days later with aggregated OvA in the footpad. Normal mice (control) were also challenged in the same way for non-specific swelling. *P < 0.05 compared with OvA-immunized group.
