Download Population PPT Part 7 Epidemiological Control

Population VII
Epidemiological Transitions
Epidemiological Transition Model
ETM-within the past 200 years, virtually every country has experienced an epidemiological transition-a long-term shift in health and disease
patterns. This transition from a high level of death for young people (communicable/infectious diseases) to low levels of death with death
concentrated among the elderly (degenerative diseases). Therefore, the variation by age of mortality is reduced. People survive to advanced ages
and then die quickly once reaching that advanced age. This transition, according to Abdel Omran (‘71), is the result of a country undergoing the
process of modernization or economic development.
The ETM closely parallels the DTM.
***In the past, parents buried their children; now, children bury their parents. (more developed countries)
Stage 1
Epidemics/Pandemics: Infectious and parasitic diseases, famine
Ex: Black Plague (25 million Europeans died)
Stage 2
Receding epidemics, infectious diseases (affects high proportion of population, but in isolation)
Ex: Cholera (contaminated water supply), Latin America-leptospirosis (Weil’s Disease), Tuberculosis (see map), West Africa-Ebola (3,000 confirmed cases),
Sub-Saharan Africa-Malaria, AIDS, Meningitis
***IN OBSERVING THE SPREAD OF INFECTIOUS DISEASES, WE MUST OBSERVE THE R NOUGHT –NUMBER OF NEW CASES AN EXISTING CASE GENERATES ON
AVERAGE OVER THE INFECTIOUS PERIOD IN A SUSCEPTABLE POPULATION
(R0=NEW/EXISTING)
Epidemiological Transition Model
Stage 3
Degenerative and human-created disease
Ex: Cardiovascular disease and Cancer
Stage 4
Delayed degenerative diseases
Ex: Alzheimer's, Diabetes
Stage 5?
Re-emerging infectious and
parasitic disease
Ex: Malaria, TB, AIDS
What is causing Stage 5? Where is it located?
What about MERS (South Korea)? Bird Flu-U.S.?
The World’s Deadliest Infectious Diseases
Regionalizing Diseases
Sub-Saharan AfricaSouth AmericaSouth Asia-
East Asia
Russia and Surrounding States-
AIDS/HIV+
2010 world distribution:
23 million in Sub-Saharan Africa
5+ million in Asia (India, China, SE Asia)
2 million in Latin America (Caribbean-Haiti)
Sub-Saharan Africa
•
70% of HIV cases
Zimbabwe, Botswana, Zambia, South Africa, Kenya
Increased death rates
Declining life expectancy
New Disease: The Zika Virus
symptoms of
Zika virus disease are fever, rash, joint pain, or conjunctivitis (red
eyes). Symptoms typically begin 2 to 7 days after being bitten by
an infected mosquito. Pregnant mothers can transmit virus to
baby and baby could possibly be born with extremely
undersized head.
Rectangularization of Death
Mortality rates declining, more people surviving to an advanced age, access to
medicine and medical care.