Infectious Disease and Epidemiology - Infectious Disease...

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Infectious Disease and Epidemiology Disease Triad relationship between Host, Pathogen, and Environment Also relationship/interaction between pathogen and other microbes Epidemiology the study and control of disease or injury patterns in human populations Etiology study of causes and origin of disease Host-Pathogen Interactions and Disease Pathogens disease causing microbes/microbes that causes harm Host an organism that shelters and supports the growth of pathogens Pathogenic microbes have special properties, allowing them to INVADE host (i.e human body) or to PRODUCE TOXINS Pathology Pathology scientific study of disease; concered with Etiology Koch Postulate(cause of disease) Pathogenesis development of disease Effects of disease Infection vs Disease Infection invasion/colonization and growth of pathogens in the body with or without disease (microbes doesn’t have to overcome the body’s defense) Disease any deviation from the normal disposition of health/ an abnormal state in which part or all of the body is not properly adjusted or incapable of performing normal function. ANY CHAGE FROM A STATE OF HEALTH (doesn’t have to involve pathogens) Opportunistic vs True Pathogens True Pathogens Cause disease in a healthy person (with normal immune defense) Opportunistic Pathogens cause disease when immune system is compromised. (special conditions). Cause disease only in the absence of normal host resistance.
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