Serological tests are qualitative, commonly used to detect immunoglobulin (Ig)G, IgA, or IgM antibodies to H. pylori infection, and are accepted as first-line nonin-vasive diagnostic methods among adults with suspected H. pylori infection in Europe.5 However, serology does not indicate whether or not the infection is active or past.5 In general, no serological assays can be utilized on their own in adolescents and children for diagnosing H. pylori infection. The gene discussed is CD79A; the disease is infection.