ANT220H5 Chapter Notes - Chapter 9: Emerging Infectious Disease, Zoonosis, Antimicrobial Resistance
Document Summary
Emerging infectious disease clinically distinct conditions whose incidence in humans has increased. May be due to the introduction od a new agent, to the recognition of an existing disease that has gone undetected or to a change in the environment that provides an epidemiologic bridge. Reemergence may also be used to describe the reappearance of a known disease after a decline in incidence. Old diseases that show an increase in incidence is refereed to as resurgent infectious disease. Social processes, sometimes acting through ecological changes that are largely responsible for these (cid:862)new(cid:863) threats. Scholars proposed a series of factors that would cause a pathogen to emerge. Ecological changes, including those due to economic development and land use. Technology and industry (globalization of food, food processing, drug use) Microbial adaptation and change (antibiotic resistance, antigen drift/shift) As humans have increasing contact with theit wild animal reservoirs, zoonoses spread.
