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lecture 15 - Concepts in Infectious Epidemiology Lecture 15...

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1 Lecture 15 Infectious Disease Epidemiology Concepts in Infectious Epidemiology { Epi Triad: Agent, host, environment { Classification of human infections by modes of transportation { Incubation period { Spectrum of disease { Herd immunity Many infectious diseases are communicable . Some are not! Definitions A communicable disease is one that can be transmitted from one human to another or from animals to humans Many, but not all are reportable diseases Measles is reportable Head colds are not Definitions A zoonosis is a type of communicable disease that is transmissible from a vertebrate animal to man. Normally it is a disease of animals Zoonoses Rabies Plague West Nile Virus Eastern Equine Encephalitis Brucellosis Anthrax Trichinosis Rocky Mountain Spotted Fever Lyme Disease Typhus Leptospirosis Q Fever Tularemia Hantavirus Example – Plague (zoonosis) In 1-6 days after an infected flea bite, the subject gets lymphadenopathy The bite gets gangrenous and necrotic – turning black The resultant infection causes septicemia and death
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