Typhoid fever is caused by typhoid bacilli (Salmonella typhi) and paratyphoid bacilli (Salmonella paratyphi A, B), which can develop into an epidemic through the digestive tract and cause diseases that affect human health.

Typhoid fever is an acute infectious disease that causes systemic bacterial poisoning, especially damage to the digestive tract. If the patient is not diagnosed and treated promptly, it will cause many dangerous complications, even damage.