a U.S. Army physician, adopted Wright's typhoid vaccine for use with the Army, and two years later, his vaccination program became the first in which an entire army was immunized. It eliminated typhoid as a significant cause of morbidity and mortality in the U.S. military. Typhoid vaccination for members of the American military became mandatory in 1911. Before the vaccine, the rate of typhoid fever in the military was 14,000 or greater per 100,000 soldiers. By World War I, the rate of typhoid in American soldiers was 37 per 100,000. During the second world war, the United States army authorized the use of a trivalent vaccine – containing heat-inactivated Typhoid, Paratyphi A and Paratyphi B pathogens. In 1934, discovery of the Vi capsular antigen by Arthur Felix and Miss S. R. Margaret Pitt enabled development of the safer Vi Antigen vaccine – which is widely in use today. Arthur Felix and Margaret Pitt also isolated the strain Ty2, which became the parent strain of Ty21a, the strain used as a live-attenuated vaccine for typhoid fever today. Antibiotics and resistance Chloramphenicol was isolated from Streptomyces by Dr. David Gotlieb during the 1940s. In 1948 American army doctors tested its efficacy in treating typhoid patients in Kuala Lumpur, Malaysia. Individuals who received a full course of treatment cleared the infection, whereas patients given a lower dose had a relapse. Asymptomatic carriers continued to shed bacilli despite chloramphenicol treatment - only ill patients were improved with chloramphenicol. Resistance to chloramphenicol became frequent in Southeast Asia by the 1950s, and today chloramphenicol is only used as a last resort due to the high prevalence of resistance. Terminology The disease has been referred to by various names, often associated with symptoms, such as gastric fever, enteric fever, abdominal typhus, infantile remittant fever, slow fever, nervous fever, pythogenic fever, drain fever and low fever. Notable people Emperor Augustus of Rome (suspected based on historical record but not confirmed), survived. Albert, Prince Consort, husband of Queen Victoria of the United Kingdom, died in 24 days after first record of "feeling horribly ill". Died 14 December 1861 after suffering loss of appetite, insomnia, fever, chills, profuse sweating, vomiting, rash spots, delusions, inability to recognize family members, worsening rash on abdomen, a change in tongue color, then finally a state of extreme fatigue. Attending physician William Jenner, an expert on Typhoid fever at the time, diagnosed him. Edward VII