Typhoid fever might be rare in developed countries, but this ancient threat, thought to have been around for millennia, is ...

Typhoid is caused by the Salmonella typhi bacterium ... contains a purified version of Vi antigen and is given in a single ...

DURING secondary response, elicited in sensitized rabbits by means of intravenous injections of the homologous antigen ... the injection of living Salmonella typhi (about 500 millions/kgm.). The ...