Inoculation Experiments against Typhus

Further Experiments in Typhus Fever

PRECISE INTERPRETATION OF OUR EXPERIMENTS SEEMS TO IMPOSE THE FOLLOWING CONCLUSIONS: Guinea pigs inoculated with washed Rickettsiae from Mexican typhus fever develop a disease identical with that resulting from inoculations with whole tunica scrapings, blood or other virulent material, and become thereby immunized to European typhus fever. The etiological agent of Mexican typhus fever is the Ri...

Protective Inoculation against Cholera

of anti-cholera vaccine. It is divided into three parts, viz., the preparation of an anti-cholera vaccine, immunization of man against cholera and the anti-cholera vaccine after its devitalisation. It is pointed out that such is the variability of the germ of cholera that it is essential to first select the particular variety of the germ which is to be selected as " authenic and appropriate." W...

Inoculation against Preventable Diseases

Experiments on the Conversion of Typhus Strains

TWO TYPES OF STRAINS OF TYPHUS VIRUS ARE OBSERVED IN MEXICO: first the murine type which is obtained from wild rats in nature, from isolated endemic cases, and from cases during short epidemic outbreaks, and second, the epidemic type of strains which is obtained from long standing serious epidemics. Some of these epidemic strains correspond entirely to strains of historic Old World typhus. Othe...

Preventive Inoculation against Enteric Fever