CD4 and Allergy: After adjusting for maternal allergy, environmental exposure, diet, frequency of viral respiratory infections, household income, parental education, and co-habitation with a smoker as factors, the percent of CD4+CD25+FOXP3+T cells in the PPG-stimulated cord blood samples was found to negatively correlate with allergy status, allergic rhinitis, and allergic eczema in children, yet not with wheezing (Table 6).