Genomic DNA extraction and conventional PCR were conducted on 350 blood samples, of which 71, which presented with good bands (following gel electrophoresis; and irrespective of corresponding infection status), were selected for IL-13 gene polymorphism analyses (i.e. IL 13-1055C/T, IL 13-591A/G, and IL 13-1258A/G) by Mass Array. This evidence concerns the gene IL13 and infection.