Lecture 5: chapter 6 epidemiological profiles of global health and disease. Prevalence j overall rate of disease per year. Case fatality = % of deaths among all people with a particular disease. Disability = physical/mental impairment that substantially limits one or more major life activity (work, personal/household tasks) Risk factor = individualized activity or condition that may increase chance of developing a disease. Virtually all societies have gone thru a transition from: high mortality, high fertility to low mortality, low fertility. Stage 1: high birth rate but fluctuating death rate. Stage 2: decline death rate contin birth rate. Stage 3: decline in both birth and death rate. Stage 4: low death and low but fluctuating birth rate. Poverty is the result unless there is moral restraint (less sex) Too many people for earth to support earth will run out of resources. Karl marx: each mode of production has its corresponding mode of reproduction.