Significantly different allelic distributions between the affected and unaffected groups were found for: the IL13 promoter SNP (rs1800925) in asthma (P = 0.038); the IL13exonic SNP (rs20541) in asthma (P = 0.0007) *; the ERBB1 SNP (rs2227983) in bronchitis (P = 0.007). The gene discussed is IL13; the disease is bronchitis.