Subjects
- Typhoid Fever -- etiology[remove]18
- Sewage -- adverse effects2
- Typhoid Fever -- epidemiology2
- Typhoid Fever -- pathology2
- Typhoid Fever -- prevention & control2
- Water Supply2
- Water Wells2
- Amines -- poisoning1
- Bacteriology1
- Chicago1
- Cholera -- etiology1
- Connecticut1
- Crassostrea -- microbiology1
- Epidemics1
- Gases -- adverse effects1
- Germ Theory of Disease1
- Infant1
- Laboratories1
- Michigan1
- Michigan -- epidemiology1
