Chapter 2 Key Issue 4

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Geography

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38 Terms

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epidemiologic transition
the branch of medical science conerned with the incidence, distribution, and control of diseases that are prevalent among a population at a special time and are produced by some special causes not generally present in the affected locality
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Stage 1: Pestilence and Famine
-high CDR
-Malthus calls these deaths "natural checks"
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What were the main causes of human deaths in stage 1?
infectious diseases, parasitc diseases, and accidents and attacks from animals and other humans
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What was history's most violent stage 1 epidemic?
the Black Plague
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How many people died from the Black Plague?
25 million Europeans and 13 million Chinese
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Stage 2: Receding Pandemics
rapidly declining CDR
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What reduced the spread of infectious diseases?
-improved sanitation, nutrition, and medicine
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What disease caused an epidemic during the Industrial Revolution?
Cholera
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What eradicated cholera?
the construction of water and sewer systems
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In what areas did cholera persist and why?
developing regions (sub-Saharan Africa, South Asia, Southeast Asia, Hispaniola etc.); people lacked access to clean drinking water
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What system helped to explain and battle stage 2 pandemics?
Geographic Information System (GIS)
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Why were the poor more likely to be affected by cholera?
they were more likely to use contaminated water
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Stage 3: Degenerative Diseases
moderately declining CDR
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How is stage 3 characterized?
a decrease in deaths from infectious disases and an increase in chronic disorders associated with aging (cardiovascular diseases, cancer, etc.)
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Why do sub-Saharan Africa and South Asia have the lowest incidence of cancer?
they have a low life expectancy
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Stage 4: Delayed Degernative Diseases
low but increasing CDR
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How is stage 4 characterized?
the major degenerative causes of death linger, but the life expectancy of older people is extended through medical advances, as well as better diets and excerise; bad diets result in obesity
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Possible Stage 5: Infectious Diseases
a reemergence of infectious and parasitic diseases, resulting in a high CDR
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What are the 3 reasons for stage 5?
evolution, poverty, and increased connections
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Reason: Evolution
-infectious diseases are evolving and adapting to drugs and insecticides
-antibiotics and genetic engineering add to the emergence of new strains of viruses and bacteria
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How was malaria first eradicated? Why is it back?
DDT was sprayed in areas infested with mosquitos; the evolution of DDT-resistant mosquitoes
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Reason: Poverty
-poorer areas have unsanitary conditions
-people can't afford drugs for treatment
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Why is tuberculosis still prevalent in poor areas?
patients are too poor to continue with the treatment, and stop taking the drugs
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Reason: Increased Connections
-new pandemics are emerging because of relocation diffusion
-motor vehicles, airplanes, etc. allow people to travel around much faster, able to spread a disease quicker
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What are some of the most lethal pandemics?
AIDS and HIV
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Why did the number of cases of AIDS rapidly drop?
the expansion diffusion of medicines like AZT
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infant mortality rate (IMR)
the annual number of deaths of infants under one year of age, compared with the total live births
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What do low IMRs show about a country?
a good healthcare system; well-trained doctors and nurses, modern hospitals, and large supplies of medicine
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What is the IMR in developed countries?
5
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What is the IMR in sub-Saharan Africa?
80
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life expectancy
the average number of years a newborn infant can expect to live at current mortality levels
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Where is life expectancy high? What is it?
wealthy countries in Europe; 80
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Where is life expectancy low? What is it?
poor countries of sub-Saharan Africa; 60
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What do developed countries offer to people who are unable to work?
public assistance and healthcare
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How much do government programs pay for healthcare costs? Individuals? (in developed countries)
more than 70%; less than 30%
EXCEPTION: the US (individuals pay over 55%, similar to developing countries)
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What are things that do NOT indicate overpopulation?
density, size, clustering in of a population
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What is overpopultion indicated by?
the relationship between population and a region's level of resources
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What is happening in overpopulated sub-Saharan Africa?
-inability of the land to sustain life
-land declines in quality, causing more effort to be needed to yield the same amount of crops (extending the working day)
-women have more children for help with work