True statement about Antistreptolysin ‘O’ titre is:
Correct Answer: In acute glomerulonephritis the titre is low
Description: Retrospective Diagnosis of Streptococcal infection
ASO (Anti Streptolysin ‘O’) titre :
– Estimation of antibody aganist streptolysin is a standard serological test for retrospective diagnosis of streptococcal infection.
– ASO titre > 200 are indicative of prior streptococcal infection.
– Raised after throat infection only
– Acute rheumatic fever :
- High level of ASO titre are usually found
- Titres > 300 or 350 are taken as significant.
– Acute glomerulonephirits :
- ASO titres are often low.
Streptozyme test – Passive slide hemaglutination test
Becomes positive after nearly all types of streptococcal infection whether of throat or skin.
Anti DNA ase B and Antihyaluronidase – Useful for retrospective diagnosis of Streptococcal Pyoderma or for acute glomerulogephritis for which ASO titre is of much less value
Category:
Microbiology
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