Microbiology - Streptococcus - Discussion

Discussion :: Streptococcus - Section 1 (Q.No.2)

2. 

Which of the following test indicates the susceptibility to streptococcal pyrogenic exotoxin?

[A]. Schick test
[B]. Disk test
[C]. ASO test
[D]. Precipitation test

Answer: Option B

Explanation:

No answer description available for this question.

Madusanka said: (May 11, 2015)  
The modification of the CAMP test for group B streptococci involved substituting a paper disk impregnated with partially purified beta-hemolysin for the staphylococcal culture that was the source of beta-hemolysin in the original test. The disk is placed onto a sheep blood agar plate beside the streak of Streptococcus being tested. The plate is then incubated aerobically at 35 degrees C.

A positive reaction consists of a lunar-shaped clear zone that appears within 24 h in the dark beta-hemolysin zone surrounding the disk. A double-blind study of 135 randomly coded streptococcal isolates showed complete agreement between the CAMP-disk test and the standard Lancefield precipitin test.

All group B streptococci tested had positive reactions, and all strains tested from streptococcal groups A, C, D, and G were negative. The CAMP-disk test is a simple and convenient way to identify presumptively group B streptococci.

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