Clostridioides difficile (C. diff), a type of bacteria which often affects people who have taken antibiotics, is responsible for approximately 2,000 deaths annually in the UK. Clostridioides difficile (C. diff), a type of bacteria which often affects people who have taken antibiotics, is responsible for approximately 2,000 deaths annually in the UK. Evolution Cell & Microbiology Phys.org – latest science and technology news stories