PATHOGENICITY FOR MAN 



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lobar pneumonia due to pneumococci of Types I and II, are some- 

 what lower in Great Britain, and possibly in Norway, Sweden, and 

 Germany, than in the United States and Canada. For 1,614 civil- 

 ian cases receiving no serum treatment in the two American coun- 

 tries, Heffron calculated the death-rate as 25 per cent for Type I 

 cases and as 41 per cent for cases due to Type II pneumococci, 

 while of Type III infections from 45 to 60 per cent of the cases 

 terminated fatally. 



FATALITY-RATES OF LOBAR PNEUMONIA DUE TO PNEUMOCOCCI 

 OF TYPES IV TO XXXII INCLUSIVE 



Note: Rates are omitted where the numbers are too small to be significant. 



