Published analysis of London mortality data in 1662 Recognized patterns and trends such as male- female disparities and high infant mortality
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1 This presentation is made available through a Creative Commons Attribution- Noncommercial license. Details of the license and permitted uses are available at nc/3.0/ 2010 Dr. James C. Scott and the Clinic on the Meaningful Modeling of Epidemiological Data MMED African Institute for the Mathematical Sciences Muizenberg, South Africa May, 2010 Title: Public Health, Epidemiology, and Models Attribution: Dr. Jim Scott, Clinic on the Meaningful Modeling of Epidemiological Data Source URL: For further information please contact Dr. Jim Scott (jimscott73@gmail.com). Jim Scott, Ph.D, M.A., M.P.H. Published analysis of London mortality data in 1662 Recognized patterns and trends such as male- female disparities and high infant mortality 3 4 1
2 In 1632 Plague: 8 Buried:
3 The science of preventing disease, prolonging life, and promoting physical health and efficiency through organized community efforts - Winslow Prevention is job #1 Works at the population level I believe the history of public health might be written as a record of successive redefinings of the unacceptable. - George Vicker 9 10 A Summarized History of International Public Health (Merson, Black, Mills, 2 nd ed.) Public Health Improvements Cleaner Water Vaccinations Improved Hygiene Education Cleaner Food Smallpox Eradication Vector Control Improved Sanitation Better Nutrition Tobacco Family Control Planning Cleaner Air 11 Google: Life expectancy 12 3
4 Key concepts Prevention is job #1 Interdisciplinary Everyone has a right to health Linked to government Works at the population level Different than medicine Public Health Assess health of populations (surveillance) Policy development Assure that services are available Prevent disease Medicine Assess health of individuals (diagnosis) Develop treatment plan (regimen) Administer treatment Cure the patient Assessment : Epidemiology and Statistics
5 Policy Development Government and International Organizations Assurance Implementation and maintenance Governments and Public Health Infrastructure e.g. The World Health Organzation Five Steps Define the problem Determine risk factors Develop interventions Implementation Assessment The problem: 1966: million cases of smallpox in 50+ countries 1-2 million deaths annually ~ 30% case- fatality ratio Higher in children Survivors scarred for life Source: Millions Saved: Proven Successes in Global Health, Center for Global Development,
6 Natural History/Risk Factors Variola virus Airborne / contact with an infected person Non- infectious for up to 17 days Flu- like symptoms high fever Rash Intervention: vaccination In existence since 18 th century Edward Jenner Improved vaccine in 1920s 1959: Global eradication program endorsed by the WHO The Decline of Smallpox Implementation 1959: 1 fulltime WHO medical officer, 1 assistant National vaccination campaigns 1965: World Health Assembly eradication of smallpox is a main objective of the WHO 1967: Smallpox Eradication Program 1970 s: focused containment teams 1973: 5 countries remaining 1977: last endemic case Source: Vaccines, 3 rd ed.,w.b. Saunders Co
7 Assessment 2 years of surveillance and searching May 1980: Smallpox declared eradicated Barriers to public health Economic Moral/religious Individual freedom Political Public Health Prevention Populations Challenging
8 Assessment Policy Development Assurance The study of the distribution and determinants of health- related states or events in specified populations, and the application of this study to control health problems Epidemiology - J. Last, Dictionary of Epidemiology The Who What When Where Why and How of Disease Descriptive Epidemiology Analytic Epidemiology 31 Slide courtesy of Warren Winkelstein 32 8
9 Describe Disease in the Population Surveillance, observation, research, experiments Person, place, and time Determinants Physical, biological, social and behavioral factors that influence health Natural History of Disease Symptoms, pathogenisis, incubation Design/Implement interventions Control disease Inform Policy Use findings to promote, protect, and restore health Big Picture Describe Disease in the Population - Surveillance - Distribution of disease Interventions - Mathematical modeling Determinants of Disease - Outbreak investigations - Observational studies - Experimental studies (RCTs)
10
11 Susceptible Host Pathological Changes Exposure Subclinical Disease (Incubation period) Onset of Symptoms Usual Time of Diagnosis Clinical Disease Recovery, Disability or Death Agent Hepatitis A virus Reservoir Humans, and rarely captive chimpanzees Mode of Transmission Person- to- person by fecal- oral route Incubation period 15 to 50 days, depending on dose Period of communicability Greatest during latter half of incubation period, continues for a few days after onset of jaundice Symptoms Fever, nausea, abdominal discomfort, jaundice Time 0.85 vs 2.11, a reduction in HIV incidence of approximately 60%
12 Universal voluntary HIV testing with immediate antiretroviral therapy as a strategy for elimination of HIV transmission: a mathematical model Reuben M Granich, Charles F Gilks, Christopher Dye, Kevin M De Cock, Brian G Williams Lancet 2009; Population or community health assessment Surveillance Individual decision making Should I smoke? Completing the clinical picture Natural History of Disease Search for causes HPV and Cervical Cancer Public health action Circumcision
13 Models allow us to gain insight into public health questions (e.g. Universal testing) Differences between: What factors increase the risk of HIV transmission? (Analytic Epidemiology) In what populations is HIV incidence/prevalence the highest? (Descriptive Epidemiology) By how much could we expect the incidence of HIV to decrease in South Africa if 80% of all sexually active people used condoms 80% of the time? (Public Health Impact) 49 1) Simple as possible Avoid unnecessary complexity Only add complexity when the research question demands it 2) Based on what is known Biological systems DATA Implies we must know relevant: - biology - statistics (how to make sense of data) 50 Slide courtesy of Warren Winkelstein 51 13
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