SIlj? Htutt?r0tig of OUttrago 



THE MECHANISM OF NATURAL AND 

 ACQUIRED STREPTOCOCCUS IMMUNITY 



A DISSERTATION 



SUBMITTED TO THE FACULTY OF 



OGDEN GRADUATE SCHOOL OF SCIENCE 



IV ('AXIHDACY FOR THE 

 DEGREE OI' 1 



DOCTOR OF PHILOSOPHY 



(DEPARTMENT OF PATHOLOGY AND BACTERIOLOGY 



GUSTAV F. RUEDIGER 



