QUESTIONS 303 



ticus and of the bacillus of swine erysipelas may, under certain cir- 

 cumstances, show the very greatest similarity, but they may also, under 

 absolutely like circumstances, show more or less apparent differences. 

 The mouse bacillus may appear in the blood of infected animals still 

 finer than the erysipelas bacillus. They may both show marked 

 differences as to cultural properties in gelatin stick cultures. The 

 mouse bacillus may grow very much more rapidly than the erysipelas 

 bacillus under absolutely the same conditions. These differences, 

 however, do not necessarily mean that the organisms are two species. 

 No investigator has yet succeeded in producing a typical erysipelas 

 in swine by inoculation with the Bacillus murisepticus, but Luepke 

 claims to have produced the mild form of swine erysipelas known 

 in German as "Backsteinblattern" (brick-pox). Rabbits and hogs, 

 according to Lorenz, can be immunized against the bacillus of 

 erysipelas by inoculation with the Bacillus murisepticus. 



From the above it appears that the question of the identity or non- 

 identity of these two bacilli cannot yet be considered as satisfactorily 

 settled. 



QUESTIONS. 



1. What are the other names for swine erysipelas? 



2. What kind of a disease is it? 



3. What is the cause of the disease? Who discovered it? 



4. Describe the pathologic lesion in the acute form of the disease. 



5. What is a glomerulonephritis? 



6. What is an endocarditis verrucosa? Is it found in swine erysipelas? 



7. What animals are susceptible to natural infection? How is the disease 

 contracted? 



8. Is the bacillus of swine erysipelas sometimes found in healthy hogs, and 

 where? 



9. What laboratory animals are susceptible to artificial infection? 



10. Under what symptoms does a mouse die when inoculated with material 

 containing the bacillus of swine erysipelas? 



11. How do rabbits act after subcutaneous and after intravenous injection? 



12. Describe the morphology and staining properties of the Bacillus rhusio- 

 pathwe suis. 



13. Describe the cultural properties, particularly the appearance of a gelatin 

 stick culture. 



14. Discuss the resistance of the bacillus. 



15. Who developed the modern methods of serum therapy against swine 

 erysipelas? 



16. How is the antiserum prepared from horses or cattle? 



17. What is meant by a double erysipelas serum? 



18. How is the serum tested as to its protective power? 



19. In what doses is the immune serum used when it is employed as a curative? 



20. How is protective inoculation practised? Describe the three different 

 methods. 



21. What kind of cultures are used in active immunization and in what doses? 



22. What is the bacillus of mouse septicemia? Who discovered it? 



23. What is the relation of the bacillus of mouse septicemia to that of swine 

 erysipelas? 



24. Is swine erysipelas ever transmitted to man ? 



