A Rough Antigen Frequently Associated with Vi in Some Enterobacteriaceae

Abstract

Conclusions

1. In some Enterobacteriaceae, particularly S. typhosa, a rough antigen (Er) has been found associated with Vi. 2. As with Vi, heat and/or alcohol dissociates the Er component from the cell and the free antigen can be used to produce Er antibodies in rabbits or to inhibit agglutination of cultures possessing this antigen by Er antiserum. 3. Like Vi the presence of the Er antigen is associated with the opaque colonial form while its absence is associated with the translucent form.