According to the World of Building Service Contracting, a new Centers for Disease Control and Prevention (CDC) study has found the number of people hospitalized with Clostridium difficile (C-diff) has been growing by more than 10,000 cases a year. Almost 300,000 hospitalizations in 2005 were traced to C-diff, twice the number in 2000 when the superbug was rarely seen. C-diff is spread by spores in feces that are difficult to kill with most conventional household cleaners or antibacterial soap and has grown resistant to certain antibiotics that work against other healthy colon bacteria.