16 Questions
What are the three components of the epidemiologic triad?
Host, agent, and environment
Which of the following is NOT a part of the environment in the infectious disease model?
Nutrient agents
What is the definition of a communicable disease?
An illness due to a specific infectious agent or its toxins transmitted from an infected source to a susceptible host
Which of the following is NOT considered a biological agent?
Chemicals
What is meant by the term 'infectious diseases result from the interchangeable interaction of a pathogen, host and environment'?
Infectious diseases result from the complex interaction of pathogen, host, and environmental factors
Which of these characteristics are included in the epidemiologic triad?
Demographic, biological, and physical characteristics
What is the time interval between invasion by an infectious agent and the appearance of the first sign or symptom of the disease?
Incubation Period
What does it mean when an infectious agent lies dormant within the host without clinical manifestations?
Latent Infection
What is the degree of pathogenicity, defined as the disease evoking power of a micro-organism in a given host?
Virulence
What is the entry, development and/or multiplication of the infectious agent in the body of man or animal called?
Infection
What does it mean when a person or animal harbors a specific infectious agent in the absence of visible clinical disease and serves as a potential source of infection to others?
Carrier
What is the time during which an infectious agent may be transmitted directly or indirectly from an infected person to a susceptible person or animal called?
Period of Communicability
What is defined as the progress of a disease in an individual over time in absence of intervention?
Natural History of Disease
What means lodgment, development, and reproduction of a parasite on the body surface or inside body tissues?
Infestation
What is defined as the time from exposure to an infectious agent to development of disease?
Incubation Period
What does it mean when non-pathogenic agents cause disease when host immunity decreased?
Opportunistic Infection
This quiz covers topics related to the natural history of diseases, patterns of spread of infections, epidemiologic triad, demographic, biological, and socioeconomic characteristics, as well as the infection cycle. It is based on the lecture by Dr. Ghazi Sharkas, an Epidemiologist and Community Medicine Consultant.
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