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60 Cards in this Set
- Front
- Back
What is epidemiology?
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Study of the DISTRIBUTION AND DETERMINANTS of health-related states or events in human populations, and the application of this study to prevent and control health problems
-Frequency and pattern |
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Distribution
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Study of frequency and pattern of health events in the population
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Determinants
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Search for causes and other factors of health-realted states or events
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Analytic Studies
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How and why
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What should be considered when evaluating a prevention or control program?
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1. efficacy
2. effectiveness |
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Efficacy
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The ability of a program to produce a desired effect among those who participate in the program compared with those who do not
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Effectiveness
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The ability of a program to produce benefits among those who are offered the program
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Epidemic
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Health-related state or event in a defined population above the expected over a given period of time
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Endemic
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Persistent, usual, expected health-related state or event in a defined population over a given period of time
-Annually |
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Pandemic
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Epidemic affecting a large number of people, many countries, continents, or regions
Ex: AIDS |
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Outbreak
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Seperated epidemic from outbreak, epidemic more large scale
-"Cluster" |
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The types of disease transmissions
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1. Direct
2. Fomite-borne 3. Vehicle-borne 4. Vector-borne |
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Direct
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Person-to-person contact
Ex: STDs |
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Fomite-borne
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By nonliving objects
Ex: Hepatitis A from utensils |
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Vehicle-borne
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A nonliving intermediary such as a fomite, food, or water
Ex: HIV/AIDS through needle |
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Vector-borne
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An invertebrate annimal
Ex: Malaria from ticks |
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Epidemiology Triangle
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Four factors that must come together for an epidemic outbreak:
1. Agent 2. Host 3. Environment 4. Time -Time is in the middle -Other three around |
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Agent
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Disease causing organism
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Host
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Will contract disease, can transmit it
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Environment
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Surroundings or conditions that allow disease to survive
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Time
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How long disease might be effective, life expectancy of the agent
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The Chain of Infection
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Agent > Reservoir > Mode of Transmission lportal of entryl > Host
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Reservoir
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Environment (Humans can be reservoir and host)
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Mode of transmission
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To a suspectible host either with direct or indirect transmission
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Fomites
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Objects such as clothing, towels, and utensils that may harbor a disease agent and are capable of transmitting it
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Vector
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An invertebrate animal capable of transmitting an infectious agent among vertebrates
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Active Primary Prevention
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Requires behavior change on part o fsubject
-Wearing protective devises -Health promotion -Lifestyle changes -Community health ed -Ensuring healthy conditions at home, school, and workplace |
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Passive Primary Prevention
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Does not require behavior change
-Vitamin fortified foods -Fluoridation of public water supplies |
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Secondary Prevention
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-Occurs to reduce the progress of disease
-The disease already exists in the person Ex: Cancer screening |
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Tertiary Prevention
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-To reduce the limitation of disability from disease
-The disease has already occured Ex: physical therapy for stroke victims, halfway hosues for recovery alcoholics, fitness programs for heart attack patients |
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Identified various modes of transmission and father of epidemiology
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John Snow
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Prepared a report that set froth the importance of establishing state and local boards of health
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Lemuel shattuck
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Provided classifications of morbidity statistics to improve the value of morbidity information
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Edgar Sydenstricker
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Observed in the 17th century that certain jobs carried a high risk for disease
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Bernardino Ramazzini
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Eradicated beriberi from the Japanese navy
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T.K. Takaki
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Introduced the words "epidemic" and "endemic"
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Hippocrates
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Advanced useful treatments and remedies including exercise, fresh air, and a healthy diet, which other physicians rejected at the time
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Thomas Sydenham
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Through an experimental study, showed that lemons and oranges were protective against scurvy
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James Lind
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Identified as the first person in the US to be a healthy carrier of typhoid fever
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Mary Mallon
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Invented a vaccincation for smallpox
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Edward Jenner
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The father of modern epidemiology
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Wade Hampton Frost
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Used data as a tool for improving city and military hospitals
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Florence Nightingale
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Conducted the first cohort study investigating the association between smoking and lung cancer
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Doll and Hill
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Promoted the idea that some diseases, especially chronic diseases, can have a multifactorial etiology, also vital statistic system
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William Farr
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Observed that milkmaids did not get smallpox, but did get cowpox
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Benjamin Jesty
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Developed a vaccine for anthrax
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Louis Pasteur
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Pioneered the use of cohort and case-control studies, genes can influence cancer risk
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Janet Lane-Claypon
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A pioneer in the field of toxicology, occupational disease investigation
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Alice Hamilton
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Credited as producing the first life table, Bills of Mortality
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John Graunt
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Used photograhy to take the first pictures of microbes in order to show the world that microrganisms in fact existed and that they caused many diseases
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Robert Koch
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Identified a healthy carrier oh typhus
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Geroge Soper
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Discovered that the incidence of puerperal fever could be drastically cut by the use of hand washing standards in obstertrical clinics
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Ignaz Semmelweis
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Virulence
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The disease-evoking power of a pathogen (intensity of a disease)
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What are two general classifications of disease?
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1. Acute
2. Chronic |
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Acute
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Disorder with sudden onset, relatively severe, and short duration of symptoms
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Chronic
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less severe but of long and continuous duration, lasting over long time periods, if not a lifetime
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What are the major stages in the disease process?
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1. Stage of susceptibility - Precedes taht of a disease process (primary)
2. Stage of pre-symptomatic disease - Disease process started but not signs (secondary) a. Incubation period - Acute diseases b. Latency period - Chronic diseases 3. Stage of clinical disease - Signs and symptoms start (tertiary) 4. Stage of recovery, disability, or death (tertiary) |
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Active Immunity
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Where the body produces its own antibodies. Thsi can occur through a vaccine or in response to having a specific disease pathogen invade the body
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Passive Immunity
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Acquired thorugh transplacental transfer of a mother's immunity to diseases to the unborn child
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What is herd immunity?
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-The resistance a population has to the invasion and spread of an infectious disease
-Based on the notion that if a population is mistly protected from a disease by immunizations, then the chance of a majority epidemic occuring is highly limited |