IL13 and tetanus: For example, subjects with atopy had significantly greater IL‐13 responses to PHA (median values 934 vs. 560 pg/mL, respectively) and to antigen specific stimuli (median values: cockroach, 17 vs. 2; dust mite, 135 vs. 59; tetanus 98 vs. 53 pg/mL) as compared to nonatopic subjects.