Epidemiology. Comes from Greek words. Study of distribution and determinants of health-related conditions or events in populations
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1 Epidemiology
2 Epidemiology Comes from Greek words epi, meaning on or upon demos,meaning people logos, meaning the study of Study of distribution and determinants of health-related conditions or events in populations
3 History Hippocrates (circa 400 B.C.) attempted to explain disease occurrence from a rational instead of a supernatural viewpoint
4 John Graunt, a London haberdasher, published his landmark analysis of mortality data in He was the first to quantify patterns of birth, death, and disease occurrence, noting male-female disparities, high infant mortality, and seasonal variations
5 Mid 1800 s William Farr began to systematically collect and analyze Britain s mortality statistics. John Snow, an anesthesiologist, conducted a series of investigations in London that later earned him the title the father of epidemiology.
6 Discipline did not flourish until the end of the Second World War
7 Uses
8 Population or community health assessment What are the actual and potential health problems in the community? Where are they? Who is at risk? Which problems are declining over time? Which ones are increasing or have the potential to increase? How do these patterns relate to the level and distribution of services available?
9 The Epidemiologic Approach Case Definition a set of standard criteria for deciding whether a person has a particular disease or other healthrelated condition.
10 Statistics and Reports When physicians diagnose a case of a reportable disease they send a report of the case to their local health department. Time - when the case occurred place - where the patient lived person - the age, race, and sex of the patient
11 Health departments convert the case counts into rates, which relate the number of cases to the size of the population where they occurred
12 Types of Epidemiology
13 Descriptive Epidemiology Organize and summarize data according to time, place, and person Time disease rates change over time the seasonal increase in influenza with the onset of cold weather Time data is usually shown on a graph
14 Place - describe a health event by place to gain insight into the geographical extent of the problem. Residence Birthplace Place of employment School district Hospital unit, etc
15 Person Inherent characteristics of people Age Race Sex
16 Acquired Characteristics Immunity Marital status
17 Activities Occupation Leisure activities Use of medications/tobacco/drugs
18 Conditions under which people live Socioeconomic status Access to medical care
19 Analytic Epidemiology Used to search for causes and effects, or the why and the how.
20 Experimental Determine the exposure status for each individual (clinical trial) or community (community trial); we then follow the individuals or communities to detect the effects of the exposure
21 Observational Observe the exposure and outcome status of each study participant Cohort study - categorize subjects on the basis of their exposure and then observe them to see if they develop the health conditions being studied Case-control study - enroll a group of people with disease ( cases ) and a group without disease ( controls ) and compare their patterns of previous exposures
22 Causation
23 Cause of disease is a factor (characteristic, behavior, event, etc.) that influences the occurrence of disease An increase in the factors leads to an increase in disease. Reduction of the factors leads to a reduction in disease
24 Epidemiologic Triangle Traditional model of infectious disease causation. Agent Host Environment
25 Agent Infectious microorganism - must be present for disease to occur Virus Bacterium Parasite Other microbe Agent Host Environment
26 Host Factors Intrinsic factors that influence an individual s exposure, susceptibility, or response to a causative agent. Age Race Sex Socioeconomic status Behaviors Host Agent Environment
27 Environmental Factors Extrinsic factors which affect the agent and the opportunity for exposure Physical factors Biologic factors Socioeconomic factors Agent Host Environment
28 Epidemiology and Disease
29 Chain of Infection Reservoir Mode of Transmission Mode of Transmission Susceptible Host
30 Chain of Infection Reservoir of an agent is the habitat in which an infectious agent normally lives, grows, and multiplies. Portal of exit is the path by which an agent leaves the source host
31 Chain of Infection Modes of transmission Direct immediate transfer of the agent from a reservoir to a susceptible host by direct contact or droplet spread Direct contact Droplet spread Indirect an agent is carried from a reservoir to a susceptible host by suspended air particles or by animate (vector) or inanimate (vehicle) intermediaries Airborne Vehicleborne Vectorborne Mechanical Biologic
32 Chain of Infection Portal of entry means by which an agent enters a susceptible host Host individual infected with the agent
33 Epidemic Disease Occurrence Level of Disease - amount of a particular disease that is usually present in a community Increasing amount of disease Sporadic Endemic Epidemic Pandemic
34 Sporadic - irregular pattern of occurrence, with occasional cases occurring at irregular intervals
35 Endemic - persistent level of occurrence with a low to moderate disease level
36 Epidemic or Outbreak- occurrence of a disease within an area is clearly in excess of the expected level for a given time period Hot Zone area where outbreak occurs
37 Pandemic - an epidemic spreads over several countries or continents, affecting a large number of people
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