What was the cause of infection for typhoid fever?

The cause of infection for typhoid fever is the bacterium *Salmonella enterica* serovar Typhi, often referred to as *Salmonella* Typhi. This bacterium is commonly transmitted through the ingestion of contaminated food or water. Poor sanitation and hygiene conditions can contribute to the spread of typhoid fever, particularly in areas with limited access to clean drinking water and proper sewage systems.