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Micr-Staph & Strep
Microbiology Final Exam
| Question | Answer |
|---|---|
| What is the gram stain of Staphylococcus | gram positive cocci clusters |
| What is the typical morphology of S.aureus | yellow/gold, opaque (beta hemolytic) |
| What is an enterotoxin | a type of exotoxin produced by S.aureus that causes GI Sx (food poisoning) |
| What are some infections caused by S.aureus | acne, wounds, TSS, nosocomial (HAI) |
| What is the characteristic leision of S.aureus | abscess and infections of the skin |
| Name 2 kinds of MRSA (methicillin resistant S.aureus) | Healthcare Associated and Community Associated |
| What is the typical morphology of S.epidermidis | white, opaque (non-hemolytic and non-pathogenic) |
| Where is S.epidermidis normal flora | on the skin |
| What is the gram stain of Streptococcus | gram positive cocci chains |
| What is the typical morphology of Streptococcus | gray, translucent |
| Green halo surrounding the colony; hemolysis slight or incomplete; sub-acute infections | alpha hemolysis |
| Clear, colorless halo; severe infections | beta hemolysis |
| No change in blood surrounding the coloney; non-pathogenic | gamma hemolysis |
| Which Lancefield group of beta Streptococcus is most pathogenic | Group A (includes S.pyogenes) |
| Which Lancefield group causes infections in newborns | Group B (Babies) |
| Which organism is grown using a bacitracin disk | Beta hemolytic Strep |
| What does a Strep culture positive result look like | group A (beta hemolytic, S.pyogenes) has a zone of growth inhibition |
| Which Strep culture is negative | can be any other group except A |
| What is the character leision of beta hemolytic Streptococci | cellulitis-fluid from damaged tissue (not pus, not fibrin) |
| Name 3 infections caused by Streptococci | strep throat, scarlet fever, rhumatic fever |
| What is an erythrogenic toxin; what does it cause | a type of exotoxin that causes a rash |
| Where is alpha hemolytic Streptococci normal flora found | in the respiratory tract, mouth,and throat |
| Where is Enterococcus normal flora found and what kind of infection does it cause | found in intestines, causes UTIs |
| What is the typical morphology of Streptococcus pneumoniae | green mucoid, translucent |
| What is the gram stain of S.pneumoniae | gram positive cocci pairs (diplococci) |
| What is the characteristic leision of S.pneumoniae | sticky fibrin |
| What disease is caused by S.pneumoniae (2) | lobar pneumonia, otitis media |
Created by:
k.fox
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