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Medical Micro
Important Info.
Question | Answer |
---|---|
Prevalence | Portion of persons infected in a population at a given time |
Incidence | number of new infections per unit time |
Endemic | usual presence of disease in a population |
Pandemic | world-wide epidemic of disease |
Index Case | the case serving as the source of infection (Thyphoid Mary) |
Incubation Period | time between exposure amd evidence of symptoms |
Zoonosis | infection naturally transmitted from animals to man |
clinical diagnosis | indentification of disease by observing it |
Epidemic | number of cases per time exceeds endemic rate |
coccobacilli | between rod and cocci |
vibrio | comma shaped |
filamentous | "stringy" long |
fusiform | short elongated |
strept | cocci in chains |
staph | cocci in clusters |
diplo | cocci in pairs |
faculatative anaerobes | can use oxygen for respiration; prefer anaerobic environments |
obligate anaerobes | can't grow in the presence of oxygen |
cell wall specializations | capsule, flagella, pili(fimbriae),glycocalex,exotoxins,endospores |
gram positive bacteria | thick peptidoglycan, teichoic acid outside, stain:purple |
gram negative bacteria | thin peptidoglycan, periplamic space between 2 layers, stain:pink |
Acid-Fast bacteria | lack cell wall, resist gram-stain, respond to carbofuchsin, only a cell membrane, bacteria:mycobacterium, mycoplasm |
growth stages | lag, log, stationary, death |
changes in temp | psycrophiles, mesophiles, thermophiles |
psycrophiles | <5*C |
mesophiles | 20-40*C (human body range) |
thermophiles | >45*C |
Staphylococcus | S. Aureus, S. Saprophyticus, S. Epidermidis |
S. Aureus | -normal flora of our skin/ area around nose -coagulase positive skin infections: impetigo, folliculitis, abscesses -mamitol-salt agar |
S. Saprophyticus | -coagulase neg. -main cause of urinary tract infections in young, sexually active females |
S. Epidemidis | -normal flora of our skin -coagulase negative - can cause endocarditis |