Typhoid fever is a systemic bacterial infection caused by *Salmonella Typhi*, primarily affecting the intestinal tract. The condition is typically transmitted through the fecal-oral route, often associated with the consumption of contaminated food or water. Pathogenesis involves the bacteria colonizing the gut lining, leading to localized inflammatory responses and systemic symptoms. Clinical manifestations include prolonged high fever, abdominal discomfort, and potential complications such as gastrointestinal bleeding or perforation. Diagnosis involves identifying the specific bacterial strain and is managed through supportive care and antibiotic therapy designed to eliminate the systemic infection.