CONTENTS. 
Page. 
Introduction 9 
Diagnosis 11 
Case card 13 
Imported cases 14 
Sex 15 
Eace 15 
Ages 15 
Nationality 17 
Length of residence 18 
Prevalence 19 
Sanitary condition of residences 24 
Disposal of sewage 25 
Water 25 
Shallow wells 27 
Bacteriologic examination of Potomac water 28 
Milk 46 
Ice cream 50 
Raw shellfish 50 
Occupation - . - 51 
Infection by contact 52 
Servants 55 
Prophylaxis 56 
SUMMARY 58 
CONCLUSIONS 59 
RECOMMENDATIONS 60 
( 5 ) 
