218 



BIOLOGY OF PNEUMOCOCCUS 



There occur, of course, local and seasonal variations in the 

 prevalence of pneumococcal types in lobar pneumonia but the fore- 

 going table furnishes a composite picture for the world at large. 

 Since the further division of pneumococci into the present thirty- 

 two serological types, the figures of Sutliff and Finland, 1361 and of 

 Bullowa, 183 as tabulated by Heffron, may be taken as representa- 

 tive of the time and place of observation (Tables A and B). 



There is no call to include in this chapter the many further de- 

 tailed analyses presented by Heffron as to the percentage incidence 

 of pneumococcal types in relation to age and sex of lobar pneu- 

 monia patients. It may suffice to include only a summary table 

 showing the collected statistics (Table C). 



A. NUMBER AND PERCENTAGE DISTRIBUTION OF CASES OF PNEU- 

 MOCOCCUS LOBAR PNEUMONIA, DUE TO TYPES I TO XX 

 INCLUSIVE, IN ADULTS (SUTLIFF AND FINLAND'S 

 AND BULLOWA'S SERIES) 



