| I: | Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. |
| II: | These pathogens generally enter the small intestine through food and water contaminated with them |
| III: | The pathogen remains confined to the small intestine. |
| IV: | Intestinal perforation and death may occur in severe cases. |
| V: | Typhoid fever could be confirmed by Widal test. |