608 BIOLOGY OF PNEUMOCOCCUS 



Figure 3 



type ii : comparison of death rates of cases whose serum 



treatment was begun within ninety-six hours of 



onset and of cases not given serum 



SSJ? with ■■■■■ 27 - 2 ^ 



136 cases, 37 deaths 



wfthSmt I I"- * 



992 cases, 407 deaths 



* Massachusetts Pneumonia Study cases, 

 f Cases collected from the literature. 



The lowering of the death rate in the serum treated Type I and 

 II cases in Massachusetts is of special importance in indicating 

 that the method can be satisfactorily used by practicing physi- 

 cians outside of large hospitals. Over one half were treated by phy- 

 sicians in general practice in the home or in small hospitals in the 

 state. 



Figure 4 



type i cases treated with serum and not treated 



with serum. number and percentage 



of deaths by age group 



10-49 years of age 50 years of age and over 



SSSS 1 "* 1 '! 8 - 8 * Illllll|30.8fo 



432 cases, 36 deaths 65 cases, 20 deaths 



N„t treated .mi 22 . 0% llll|]llll|[nill!llll 60.7% 



with serum 



141 cases, 31 deaths 28 cases, 17 deaths 



* Seven cases were not included as the age was not known. 

 Note: Cases were taken from the Massachusetts Pneumonia Study. 



