Epidemiology of Disease

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Factors Influencing Disease Transmission Agent Environment Agent-Host Factors Host Susceptibility = host vulnerable to infection • Age • Vaccination status Infected (Infectious) = host colonized and a source of infection for others (may be clinically sick, or may not) Recovered = infection cleared • Pathogen threshold required to stimulate immune response • Rate of pathogen clearance by the immune system
Factors Influencing Disease Transmission Agent Environment Agent-Host Factors Host • Infectivity = the size of the dose required to cause infection in a susceptible host • Reproductive rate – Reproduction in host – Reproduction between hosts • Virulence = the magnitude of the adverse effect on the host
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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