<em>Clostridium difficile </em>are anaerobic gram-positive rod-shaped bacteria. This species of <em>Clostridium</em> has an incubation period of days to weeks and causes severe diarrhea and fever. It causes antibiotics related colitis termed as pseudomembranous colitis. The epithelial lining of colon undergoes necrosis due to the bacterial toxins. The affected individuals exhibit abrupt diarrhea, presence of blood and toxins in stool.
Yes, leaves that are of any other colors than green also have chlorophyll. The green colour of chlorophyll is just hidden beneath other pigments of the leaf.