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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 |