Streptococcal infections.pdf jeufjdhwjsn

This presentation is about streptococcal infections and its clinical significance diagnosisufoebdidjemdu

1. STREPTOCOCCAL INFECTIONS
Name:-Anshuman
Roll no:-8/21010302008
Submitted to:-Department of Microbiology

2. STREPTOCOCCUS
Gram positive
Spherical
Oval shaped
Arranged in chains of varying lengths mostly
diplococci
Grows well on blood agar

3. ANTIGENIC STRUCTURE
Hyaluronatecapsule
Hyaluronateenzyme
Groupspecificpolysaccharideantigen
Typespecificantigen
Toxins–HemolysinandErythrogenictoxin
Enzymes-Streptokinase,Streptococcal
deoxyribonucleaseandhyaluroninase

4. SUP P URATIVE LESIONS
SORE THROAT ERYSIPELAS CELLULITIS

5. NON-SUP P URATIVE LESIONS
Acute rheumatic fever Acute glomerulonephritis

6. LAB DIAGNOSIS
HAEMATOLOGICAL INVESTIGATION
Increase in total lecocyte count
DLC shows increase in neutrophil more than
80%
ESR shows increase in case of rheumatic fever
BACTERIOLOGICAL INVESTIGATION
Gram positive cocci in chains is indicative of
streptococcal infection
Specimen is inoculated on blood agar medium and
incubated at 37c for 18-24 hours
Colonies are circular low convex with a zone of beta
hemolysis around them
SEROLOGICAL TESTS
ASO test – to check rheumatic fever
Skin test – to check succeptibility of the
patient to scarlet fever