How does the disease get transmitted?

A patient showed symptoms of sustained high fever, stomach pain and constipation, but no blood clot in stools. Name the disease and its pathogen. Write the diagnostic test for the disease. How does the disease get transmitted?

Typhoid is the disease that shows symptoms like high fever, stomach pain and constipation. Its causative agent is Salmonella typhi.
Widal test is used for its diagnosis. Typhoid is transmitted through contaminated food and water.