Human: How much does a typhoid vaccine cost? Assistant: 
Typhoid is caused by the bacterium Salmonella typhi. It is spread through contaminated food or water and can cause fever, abdominal pain, headache, and rash. The most common symptoms are high fever, chills, fatigue, loss of appetite, nausea, vomiting, diarrhea, constipation, and joint pain. Typhoid vaccines are usually given to children in developing countries who live in areas where there is a high risk of infection.