Microbiology – Chapter 13.pptVIP

Microbiology – Chapter 13 Pathology: Science of study of disease Etiology: Cause of disease; often microbial Flu – etiological agent, Influenza virus Tb – M. tuberculosis Pathogenesis: development of disease in the host - Norwalk virus; Fecal – oral, diarrhea Disease: altered state of health, host body is changed, upset of homeostasis Microbiology – Chapter 13 Epidemiology: Science of the study of how diseases are acquired and spread in a population Outside assignment 3: Note that the last question has been changed to focus on MDR bacterial infections. Be sure to get a copy of the last page from instructor ** You may have to do some research ato answer all of the questions. Use other Micro. Books or other research tools. *** Microbiology – Chapter 13 Relationship between organisms: Normal flora: normal inhabitants of the host ex. S.epidermidis on skin, E.coli in intestine Commensalism – One organism benefits; the other unaffected; can be opportunistic infector Mutualism: both benefit; E. coli makes us Vit. K; We provide nice environment and food Microbiology – Chapter 13 Parasitism: One benefits at the other’s expense; tapeworm or leach Virulence: potency; how quickly they infect, spread, cause tissue damage or disease symptoms Influenza A H5N1, very virulent form of flu, or encapsulated pneumococci Virulence factors: factors that cause disease or aid in spread of disease quickly in host or to other hosts (more later) Microbiology – Chapter 13 Pathogen: actual agent of disease, MRSA – S. aureus BACTERIAL, VIRAL, FUNGAL, HELMINTH Carrier: Infected healthy individual, no symptoms (asymptomatic), or very mild form of disease, yet they both can spread disease to others – many bacterial and viral pathogens Classic case was typhoid Mary (look it up) Microbiology – Chapter 13 Reservoir: Where pathogen is maintained , can be in an organism (animal), in the environment (stagnant water - Legionella), or even in soil (Clostridia) Vector: