PATHOGENICITY FOR MAN 237 



9. Healthy persons may harbor pneumococci of one or more 

 types in the mouth and throat with no harm to themselves. 



10. The carrier state may be due a) to pneumococci implanted 

 by transference from other persons or b) to organisms arising 

 from pneumococcal disease within the individual. 



11. The organisms implanted by transference are largely of the 

 heterogeneous types formerly classified as Group IV, except in the 

 event that the donor is suffering or recovering from an attack of 

 pneumonia due to the predominant types. The pneumococci that 

 are autogenous in origin are of the type causing the pneumonia. 



12. The carrier state may be brief (transient), prolonged 

 (chronic), or sporadic (chronically intermittent). 



