The correct option is D All of the above
Shigella is a common cause of intestinal illness in the tropics, but is rare in this country. They can cause diarrhoea, cramping, and fever. Most cases are minor, but these infections can be quite severe, especially in the young, the pregnant, or those with compromised immune systems. Salmonellae are carried by reptiles, birds, and wild rodents. Salmonellosis is one of the most common causes of diarrhoea and food poisoning in man. Escherichia coli is one of the most common intestinal bacteria and is a normal part of every mammal's intestinal flora. Disease caused by pathogenic strains of E. coli is most likely to be seen in cattle, swine, and humans.