Epidemiology of Disease

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Factors Influencing Disease Transmission Agent Environment Agent-Environment Factors Host Hardiness – how long can it survive in the environment • Agent structure, temperature, sunlight, moisture content, pH all impact survivability • Enveloped viruses (BVDV) tend to be less stable than non-enveloped (FMD) • Spores (Clostridia) very stable is soil for many years
Factors Influencing Disease Transmission Agent Environment Agent-Environment Factors Survival/ Amplification in environment Host • Salmonella does not seem to multiply significantly outside of GI, but can survive several weeks in water and several years in soil if conditions of temperature, humidity, and pH are favorable. • Listeria can persist in soil and propagate in spoiled silage
Page 1 and 2: May 1, 2007 POPH 5160: Infectious D
Page 3 and 4: Overview of this Session… Descri
Page 5 and 6: Epidemiology The study of the caus
Page 7 and 8: What’s the Relevance to a Veterin
Page 9 and 10: So…if We Can Manage Risk, We Can
Page 11 and 12: Infectious Disease Transmission A c
Page 13: Dynamics of Intramammary Infections
Page 16 and 17: Temporal Patterns of Disease Patte
Page 18 and 19: Temporal patterns of disease Epide
Page 20 and 21: Common Source Epidemic Curve 15 12
Page 22 and 23: Propagated Epidemic Curve 15 12 Num
Page 24 and 25: Factors Influencing Disease Transmi
Page 34 and 35: Epidemiological Triads and the “I
Page 36 and 37: Four Common but Serious Mistakes Du
Page 38 and 39: Four Common but Serious Mistakes Du
Page 40 and 41: Hazards Analysis and Critical Contr
Page 42 and 43: Conclusions Diseases normally do n

Epidemiology of Disease

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