Aspergillusantigen-treated wild-type,Mcp-1-/-andCcr2-/-mice demonstrated intact Th2 cytokine production and induction of IgE. For cytokine determination, draining lymph node cells from Aspergillus antigen-treated wild-type, Mcp-1-/- and Ccr2-/- mice were isolated and stimulated with PMA/ionomycin for 40 hr and cytokine levels for IL-4 (A), IL-5 (B), IL-13 (C), and IFN-γ (D) were quantitated by ELISA. Serum IgE (E) from Aspergillus antigen-treated wild-type, Mcp-1-/- and Ccr2-/- mice and control mice were measured by ELISA. In (A-D), bars represent mean ± SE; in (E), results are expressed as the common log of IgE concentration where each circle represents a single PBS- or Aspergillus antigen-treated mouse and horizontal lines represent the mean of each group (PBS-treated, N = 5 mice/group; Aspergillus antigen-treated, N = 8–9 mice/group). Aspergillus antigen exposure and sample collection are described in methods. Asterisks (*) indicate values that are statistically significantly different (p < 0.001) compared to PBS controls.