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60

Mapped the occurrence of cholera in London

Descriptive epidemiology

John snow

61

Showed that improved sanitation decreased the incidence of epidemic typhus

Analytical epidemiology

Nightingale

62

Showed that hand washing decreased the incidence of puerperal fever

Experimental epidemiology

Semmelweis

63

Collection and analysis of data regarding occurrence of disease

Descriptive epidemiology

64

Comparison of a diseased group and a healthy group

Analytical epidemiology

65

Study of a disease using controlled experiments

Experimental epidemiology

66

The study of where and when diseases occur and how they are transmitted in population

Epidemiology

67

1. Contact
-direct
- indirect
- droplet
2. Vehicle transmission
3. Vectors
-mechanical (passive)
-biological (active)

Transmission of disease

68

Transmission by an inanimate reservoir (food,air,water)

Vehicle transmission

69

Arthropods, especially fleas, ticks and mosquitoes transmit disease by two methods.
1. Mechanical-arthropod carries pathogens on feet
2. Biological (active) pathogen reproduces in vector

Vectors