Microbiology - Bacteria Flashcards
Name the 8 G+ cocci
Staph aureus Staph epidermidis Staph saprophyticus Strep pyogenes (Gp A) Strep agalactiae (Gp B) Strep pneumoniae Strep viridans Enterococcus
Name the 3 conditions caused by Staph toxin and name the toxins.
Toxic shock syndrome (TSST-1)
Food poisoning (preformed enterotoxin)
Scalded skin syndrome (exfoliatoxin)
Incubation period for Staph food poisoning
2-6 hours
Is the enterotoxin produced by Staph aureus heat labile or stabile?
Stabile
Which bacteria causes bullous impetigo?
Staph aureus (exofoliative toxin strains)
What is the underlying pathology in scalded skin syndrome?
Destruction of keratinocytes in stratum granulosum
What type of pneumonia does Staph aureus cause?
Lobar
What type of bones does Staph aureus affect in
A) Children
B) Adults
A) Long bones
B) Vertebrae
Which two organisms are the main causes of cellulitis?
Gp B strep (usually)
Staph aureus
Name the three anti-Staph penicillins.
Dicloxacillin
Naficillin
Oxacillin
Which cephalosporin can be used for Staph aureus infections?
Cefalexin (1st generation)
5 virulence factors of E. Coli and presentation
- LPS - bacteraemia and shock
- K1 capsular polysaccharide - neonatal meningitis
- Verotoxin (Shiga-like toxin) - bloody gastroenteritis
- Heat stabile/labile enterotoxins - watery gastroenteritis
- P fimbrae - UTIs
Gram - rod, fast lactose fermenter (3)
Klebsiella
E. coli
Enterobacter
Gram - rod, slow lactose fermenter (2)
Citrobacter
Serratia
Gram - rod, lactose non-fermenter, oxidase +ve
PsA
