strep skin infections OSPE Flashcards
1
Q
case ( impetigo)
A
13 year old,honey crusted lesions on the nasal fold and mouth.
2
Q
sample
A
wound swabs
tissue biopsies
serum
blood culture
3
Q
microscopy
A
gram positive cocci in chains
4
Q
culture
A
blood agar: beta haemolytic colonies
5
Q
biochem
A
PYR hydrolysis: +ve
catalase:-ve
Bacitracin sensitive
6
Q
serology
A
ag/M protein/toxin detection: ELISA ,LA
Ab detection:
Anti-DNAase B titer: >300 IU/L
anti-streptokinase Ab
Anti-M type sepcific AB
ASO titer(pharyngitis)
7
Q
molecular
A
PCR for grp A ag
8
Q
go thru slide
A
qna
