Helicobacter pylori diagnosis and management / Ratha-Korn Vilaichone, Varocha Mahachai, and David Y. Graham -- Bayesian approach to acute infectious diarrhea in adults / Richard Goodgame -- Epidemiologic and clinical importance of norovirus infection / Robert L. Atmar and Mary K. Estes -- Updated review on cryptosporidium and giardia / David B. Huang and A. Clinton White -- Update on diagnosis, treatment, and prevention of clostridium difficile-associated disease / Saima Aslam and Daniel M Musher -- New insights and directions in travelers' diarrhea / Herbert L. DuPont -- Probiotics in the prevention and treatment of gastrointestinal infections / Elizabeth S. Huebner and Christina M. Surawicz -- Diagnosis and management of diverticulitis and appendicitis / Edward P. Dominguez, John F. Sweeney, and Yong U. Choi -- Management of suspected pancreatic sepsis / Tyler M. Berzin, Koenraad J. Mortele, and Peter A. Banks -- Approach to the patient who has suspected acute bacterial cholangitis / Waqar A. Qureshi -- Hepatitis B: the pathway to recovery through treatment / F. Blaine Hollinger and Daryl T.-Y. Lau -- Treatment of hepatitis C infection / Rise Stribling, Norman Sussman, and John M. Vierling -- HIV-related liver disease: infections versus drugs / Homayon Sidiq and Victor Ankoma-Sey.