HLTH 101 Lecture : Health 101 Topic 7 External Ecology: Societal Factors Potentially Associated with Infectious Disease Risk (abstract) 1/ POPULATION GROWTH 2000: 6 billion people 2050: estimated 9 billion -increase in population could mean increase risk of infecti
16 Oct 2011
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Increase in population could mean increase risk of infection. Past 50 years, 25% of the population of rural has moved to urban. Estimated by 2030, 75% of population in cities. Underdeveloped countries: reduced capacity for infrastructure (sewage, trash, sanitation, health care) Problems: increase in crowding reduces sanitation which increases cohabitation with rodents which increases water, food, vector-borne diseases (arthropods like ticks or fleas and bites from cohabited animals. Increased pressure for sex trade workers (could be less likely to care about own health: migration. Approximately 30 million internally (inside country) displaced people. Results in spread of disease, increased crowding, low infrastructure, bad living conditions. 21st century: more likely to die in combat than from a disease. Also increases migration (crowding, reduces resources (ie. sanitation and health) Increased transportation of vectors and reservoirs (ie. through deliveries) Ie. malaria: arrived in brazil (1937) from mail boat. Dengue fever (1 million infected, 20 000 deaths/year)
, their current population was estimated to be 
. After a few years, they found out that their population increases by
every year. If they wanted to increase their population to 
, at what year will they reach it? Round the years to the nearest ones.