Epidemiology of Disease

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Factors Influencing Disease Transmission Agent Disease Environment •Dose • Housing (ventilation, sanitation) • Environmental hardiness • Environmental conditions • Virulence (microbial) RISK (temperature, humidity, airflow, • Infectivity (microbial) precipitation) • Toxicity (poisons) • Stocking density • Antigenic stability • Nutrition (protein, energy and • Survival macromineral and micromineral Host • Age adequacy) • Innate resistance (e.g. gastric barrier, mucocilliary action) • Previous exposure/ active immune status • Passive immune status (neonates) • Vaccination status and response • Production status (e.g., lactating vs. non-lactating)
Epidemiologic Triad Agent Environment Host Recognizing the components of the triad is critical to control infectious disease A variety of opportunities to reduce disease at multiple points in the transmission cycle A common mistake is to focus on only one area for disease control or prevention and to overlook the others
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 26 and 27: 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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