PUBH 1001 Chapter Notes - Chapter 7-8: Herd Immunity, Air Quality Index, Built Environment
Document Summary
Communicable disease: caused by a wide variety of organisms, ranging from bacteria, to viruses, to a spectrum of parasites, including malaria and bookworm. Infectious disease: intended to include both communicable disease and disease caused by organisms that are not communicable. Communicable- distinguished from other diseases by its ability to be transmitted from person to person or from animals, environment, etc. Pandemic: epidemic occurring worldwide, or over a very wide area, crossing international boundaries and affecting a large number of people. Epidemic: implies that a disease has increased in frequency in a defined geographic area far above its usual rate. Endemic: implies that a disease is present in a community at all times but a relatively low frequency. Establishing that an organism is a contributory cause of a disease traditionally relied on. Koch"s postulates hold that in order to definitively establish a cause and a effect relationship, all of the four following conditions must be met:
