Typhoid Fever

A single dose of Vi-tetanus toxoid conjugate vaccine provided protection against typhoid fever in children aged 9 months to 16 years, according to data from a large study published in The Lancet.

Typhoid fever and paratyphoid fever are clinically indistinguishable and produce the syndrome known as enteric fever. Both are caused by Salmonella that infect only humans. Therefore, when the diagnosis of typhoid or paratyphoid fever is made, the origin is another human.