To investigate whether susceptibility or resistance to Artemisia allergic rhinitis is associated with HLA-DRB alleles or not, Xing [73] tested the frequency distribution of HLA-DRB alleles in 41 patients with Artemisia allergic rhinitis (AR) and in 41 healthy controls from Beijing, China, using PCR-SSP (sequence-specific primer polymerase chain reaction). Here, HLA-DRB1 is linked to allergic rhinitis.