Wordsology High Yield Notes - Gram Positive Cocci Flashcards
What two organisms are coagulase positive?
Staph aureus and Staph intermedius
What two types of Gram positive cocci are catalase positive, coagulase negative?
Coagulase negative Staph and Micrococcus
What are characteristics of Gram positive, coagulase positive Staphylococcus?
Staph aureus and Staph intermedius
- Salt tolerant
- Beta hemolytic
- Hyaluronidase
- Enterotoxins –> scalded skin syndrome
- Cause toxic shock syndrome (TSS)
- 50% people have as normal flora
What test(s) differentiate coagulase negative Staphylococcus from Micrococcus?
Oxidase/Microdase (modified oxidase test)
and
Bacitracin/Lysostaphin
Are coagulase-negative Staphylococcus oxidase/microdase positive or negative?
Oxidase/Microdase negative
Are coagulase-negative Staphylococcus bacitracin resistant or susceptible?
Resistant
What is susceptible to and shows a >16mm zone of inhibition to Novobiocin?
Staphylococcus epidermidis
What organism is an opportunistic pathogen and may cause endocarditis if allowed the opportunity to enter surgical wounds?
Staph epidermidis
What organism possesses glycocalyx (capsule/slime layer/biofilm)?
Staph epidermidis
What Gram-positive organism causes UTI in sexually active females?
Staph saprophyticus
Novobiocin is used to differentiate:
Staphylococcus epidermidis (susceptible) from Staphylococcus saprophyticus (resistant)
A gram positive organism is bacitracin susceptible and oxidase positive. What could it be?
Micrococcus
What test would you perform if you saw an alpha-hemolytic streptococcus colony?
Optochin disk to determine if it is Strep pneumo (susecptible).
What organism is lancet shaped in pairs?
Strep pneumoniae
What organism has glistening, wet, domed colonies?
Strep. pneumo
What organism has a quellung reaction (capsular swelling)?
Strep pneumoniae