1. The organisms isolated by Hirschfeld from febrile cases resembling paratyphoid fever and named Paratyphoid C can be placed in the hog-cholera bacillus group by their agglutination absorption properties though they are not typical culturally.
2. When fed to a pig a febrile disease resulted from which the animal recovered. After injection of hog-cholera virus the organisms fed were found generally, distributed and some of them had lost cultural characters so that they are brought into the class of typical hog-cholera bacilli except for their low virulence for rabbits.
3. While hog-cholera bacilli have many opportunities to infect man. they either are not able to grow in the human body or, what is less likely, they do grow and lose the characters that distinguish them.