Comparison of total immunoglobulin G and subclass response (IgG I — IV) to Helicobacter pylori infection in children versus adults: B. Khanna1, N. Israel1, A. Lastovica2, and B.D. Gold1. Department of Pediatrics, Emory University School of Medicine, Centers for Disease Control and Prevention, Atlanta, GA1; Dept. of Med. Microbiology, Red Cross Children's Hospital, Cape Town, South Africa2