Human Microbe Flashcards
What is mutualism, commensalism, and parasitism
both benefits, one benefits one unaffected, one benefits one harmed
What is the difference between contamination, colonization and infection
mere presence of microbes, conditions are right for bacterial growth, evade body defenses and become established
What is a biofilm
when pathogens attach and bind to each other
Symptoms vs signs
subjective characteristics vs objective manifestations
What are 4 parts of Kochs postulate
- agent must be present in every case of disease and not found in healthy subjects
- isolated and grown in pure culture
- agent must cause disease when into a healthy susceptible host
- agent must be reisolated
Pathogenicity vs virulence
ability of organism to cause disease, degree of pathogenicity
What is hyaluronidase and collagenase
breaks up hyaluronic acid, breaks peptide bonds in collagen
What does coagulase and kinase do
forms clot, dissolves clot when time right
Where are exotoxin and endotoxins found
gram positive and negative, lipid A of LPS of gram negative
Where is the most bacteria in the GI tract
colon large intestine
What is helicobacter pylori and what does it do
gram negative bacteria that causes peptic ulcers
- binds to epithelial cells and adhere
- secretes toxins that thins mucus
- destroys cells and causes HCl to leak past cells
What are coliforms
aerobic or facultatively anaerobic gram negative rod shaped bacteria that colonize GI
