Identify the correct statement regarding typhoid fever in human beings:
| 1. | It is caused by a pathogenic protozoan Salmonella typhi |
| 2. | The pathogen remains confined to the small intestine |
| 3. | Widal test can confirm the infection very early in the disease |
| 4. | Intestinal perforation and death may occur in severe cases |
The name Mary Mallon is associated with:
| 1. | Tuberculosis | 2. | Typhoid |
| 3. | Leprosy | 4. | Rabies |