Epidemiology of Disease

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Four Common but Serious Mistakes Due to Misunderstanding The "Iceberg" Phenomenon 1) Considering only the clinically (observably) ill animals in the midst of an outbreak For example, if precautions are applied only to clinically sick animals, subclinically infected (normal appearing) but shedding animals can continue to infect other susceptible animals Normal appearing animals can be infected • The saying that "most disease is bought and paid for"
Four Common but Serious Mistakes Due to Misunderstanding The "Iceberg" Phenomenon 2) Interpreting the absence of clinical cases as the absence of the disease/ infection in any form Many infections enter a herd by importation of a subclinical chronic carrier animal May spread for weeks to years before the infection is finally diagnosed in a clinical case Productivity is lost due to the subclinical form of disease, but loss may be difficult to recognize/ visualize • As a consequence, action may not be taken until the problem becomes clinical EX: Johnes Dz, Staph aureus mastitis, "hairy heel warts"
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 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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