Typhoid vaccine
Typhoid fever is a systemic bacterial infection; illness includes a severe and prolonged fever, weakness, and exhaustion. Infection occurs by consuming contaminated food or water. Two types of vaccine are available: injectable and oral. One dose of the killed bacterial injectable vaccine protects for 2-3 years. Four doses of the live oral bacterial vaccine (given on days 0, 2, 4, and 6) provide up to 5 years of protection. Local pain at the injection site occurs frequently. Gastrointestinal distress and diarrhea can occur after receiving the oral vaccine.