HRS 1017 Lecture Notes - Lecture 4: Avian Influenza, Common Source, Unimodality

• School: Pitt
• Department: Health and Rehabilitation Scs
• Course: HRS 1017
• Professor: Thomas Songer

Document Summary

Mode of transmission: direct contact- bird to human, indirect contact- airborne. Portal of exit is only if the reservoir is human. Infectious diseases are often counted in the community to identify if epidemics have occurred or are occurring. A constant or steady level of disease in a population. A level of disease in a population that exceeds normal expectancy. Describes levels of infectious disease in a population. Fewest number of cases before the minimum incubation period. Midline of the curve defines the usual incubation period. Prolonged exposure to source widens the apex of the common source curve. Type of common source epidemic in which all susceptible individuals are exposed at one point in time. Typically sharp peak- only one incubation period. Decline in a curve is more rapid. The epidemic curve can have several increases or peaks over time, perhaps reflecting the agent being transmitted to different individuals. Multiple exposure exist rather than one event.