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Lesson Plan 11
Time: 60 min
Title: Introduction to Microbiology & Epidemiology
Learning Expectations:
1. Define pathogens
2. Explain the different types of pathogens and water related diseases
3. Recognize how pathogens are transmitted
Materials Required:
 F-diagram activities (optional)
Topics and Key Points
Time
(min)
5
Learning Strategies
1. Introduction to Microbiology & Epidemiology
 Microbiology: study of microorganisms
 Epidemiology (study of the incidence and
distribution of disease and prevention)
 Pathogens- disease causing organisms
2. Pathogens
 Pathogens- disease causing organisms
 Microbes are so small they are difficult to see
even with an expensive microscope
 Viruses 0.2-5 microns
 Bacteria 0.02 – 0.2 microns
 Protozoa 4-20 microns
 Helminthes (worms, parasites) 40 – 100 microns
3. Water Related Diseases
 Waterborne- ingestion of contaminated water
- intervention: remove or kill agents
 Water washed- contact with contaminated
material
- intervention: increase quantity and quality or water
used
 Water based- infections caused by pathogenic
worms
- reduce contact with infected water and remove
worms from water
 Water related- acquired from vectors (not water)
whose life cycles depend on access to water
- make water inaccessible to vectors, control insects,
prevent insects from biting
 http//www.cellsalive.com/
howbig.htm
5
(Day
4-5)
(Day
4-4)
20
Topics and Key Points
Learning Strategies
4. Extent of Water Diseases
 % of diseases caused by poor water
 Numbers from various diseases
Time
(min)
5
5. Factors Affecting Disease Transmission
 Susceptibility- more susceptible include infants
and young children, the elderly, and the already
sick
Infectious dose- the minimum number of organisms
required to cause an infection
5
6. Impacts on Public Heath
 Burden on health care
 Poverty
 Human development
Refer to poverty cycle
5
7. Transmission Routes
8. Review
Reflection:

Transmission Route
Activity
10
5