C. difficile (Clostridium difficile)

C. difficile (CD) infections may be transient or may progress to be life-threatening and are a leading cause of morbidity and mortality in hospital-acquired infections in the U.S. according to the U.S. Centers for Disease Control and Prevention (CDC). The incidence of CD infections has risen sharply over the last two decades with nearly 500,000 infections occurring in 2011 which resulted in 29,000 deaths, with mortality often occurring within 30 days of diagnosis.

XBiotech is developing an oral antibody therapy to treat CD infections. The antibody therapy is aimed at treating a very serious form of diarrhea and intestinal inflammation caused by CD. The R&D program began with screening more than 500 healthy human volunteers for antibodies that neutralize the causative agent of the disease and isolating the genetic information encoding these antibodies in individuals. The Company searched for antibodies that could be expected, when taken orally, to be particularly effective at blocking both the motility of the bacteria and its ability to bind to the intestine. Using this proprietary discovery technology, the Company succeeded in identifying high affinity antibodies. XBiotech has completed preliminary animal studies that showed that some of these antibodies are capable of reducing the severity of infection and injury to the intestine in CD infected animals. Antibody combinations (blocking both CD binding and motility) will now be evaluated to further improve effectiveness of a therapy to prevent CD. Based on these results, antibodies are now being developed in our manufacturing production system, which could enable adequate quantities of antibody product for potential use in clinical trials and commercial development.