Epidemiology Answers – Flashcards

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Epidemiology
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  • the study of the occurence, distribution, and determinants of health and disease in a population
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Endemic
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constantly present within a population at low levels
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Epidemic
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simultaneous infection of large numbers in a population
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Pandemic
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very widespread disease, often worldwide
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Infection
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the organism invades and colonizes the host
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Incubation period
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the time between infection and onset of symptoms
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Acute period
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the disease is at its height
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Decline period
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disease symptoms are subsiding
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Convalescent period
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patient regains strength and returns to normal
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Incidence
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the number of new cases in a time period
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Prevalence
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the number of total cases, new and existing
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Mortality
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the incidence of death in a population
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Morbidity
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the incidence of disease including fatal and nonfatal diseases
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Reservoir
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  • a site in which infectious agents remain viable and from which infection of individuals can occur
  • can be human, animal, or environmental

 

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Zoonosis
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  • any disease that primarily infects animals but is occansionally transmitted to humans
  • control of this may not eliminate the disease as a potential public health problem
  • have have complex life cycles involving an obligate transfer from nonhuman to human and back to nonhuman host
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Epidemiological factors
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  • geographic data (epidemic centers)
  • climatic data
  • social data (social activity, drug use, ect)
  • demographic data (age, gender, ect)
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Direct host-to-host transmission
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infected individual transmits a disease directly to a susceptible host without the assistance of an intermediary (flu, common cold, STDs, ring worm)
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Indirect host-to-host transmission
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occurs when transmission is facilitated by a living or nonliving agent
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Vectors
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living agents that transmit disease
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Fomite
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nonliving agents that transmit disease (bedding, toys, cash, surgical instruments)
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Common-source epidemic
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  • arises from contamination of water or food
  • is a very rapid increase than drops off
  • people aquire disease at the same time but does not spread
  • Ex: Cholera
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Host-to-host epidemic
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  • the disease shows a slow, progressive rise and a gradual decline
  • people pass it on to one another
  • Ex: influenza
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Herd immunity
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  • the resistance of a group to infection due to immunity of a high proportion of the group
  • If one person is infected and 60-70% are immune the disease can only spread to the susceptible
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Nosocomial infections
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  • result from an infectious agent aquired at a health care facility
  • are about 1,700,000 per year in the U.S.
  • aquired from patients or caused by pathogens
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Why do people get HealthCare-Associated Infections?
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  • low resistance to the infectious disease
  • the facilities treat infectious  disease patients
  • multiple patients in the same room and personnel move from patient to patient
  • infants are susceptible
  • surgical procedures expose organs to contamination
  • use of antibiotics has caused antibiotic-resistant organisms
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