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Table 3 Superantigen genotype and distribution across emm type

From: Distribution of superantigens in group A streptococcal isolates from Salvador, Brazil

Genotype

speA

speC

speG

speH

speI

speJ

speK

speL

speM

ssa

smeZ

emm12 (40)

emm1 (25)

emm66 (12)

p-value

A (n = 1)

X

 

X

 

X

   

X

 

X

0

1 (4%)

0

 

B (n = 17)

X

 

X

       

X

0

13 (52%)

4 (33.3%)

<.001

C (n = 1)

X

 

X

  

X

   

X

X

0

1 (4%)

0

 

D (n = 7)

X

 

X

  

X

    

X

0

7 (28%)

0

<.001

E (n = 3)

X

 

X

 

X

     

X

0

2 (8%)

1 (8.3%)

 

F (n = 1)

X

 

X

 

X

X

    

X

0

1 (4%)

0

 

G (n = 1)

  

X

X

X

   

X

 

X

1 (2.5%)

0

0

 

H (n = 2)

 

X

X

X

X

    

X

X

2 (5%)

0

0

 

J (n = 19)

 

X

X

X

X

     

X

19 (47.5%)

0

0

<.001

K (n = 3)

 

X

X

       

X

3 (7.5%)

0

0

 

M (n = 2)

 

X

X

X

X

   

X

 

X

2 (5%)

0

0

 

N (n = 8)

  

X

X

X

     

X

5 (12.5%)

0

3 (25%)

 

O (n = 1)

X

X

X

X

X

     

X

1 (2.5%)

0

0

 

P (n = 1)

  

X

       

X

0

0

1 (8.3%)

 

Q (n = 4)

 

X

X

 

X

     

X

4 (10%)

0

0

 

R (n = 1)

 

X

X

X

X

X

    

X

1 (2.5%)

0

0

 

S (n = 1)

 

X

X

 

X

    

X

X

1 (2.5%)

0

0

 

T (n = 1)

  

X

X

X

X

     

0

0

1 (8.3%)

 

U (n = 2)

  

X

X

X

    

X

X

1 (2.5%)

0

1 (8.3%)

 

V (n = 1)

X

 

X

X

X

     

X

0

0

1 (8.3%)

 
  1. Superantigen genotypes B and D were found significantly more often in emm type 1 isolates. Superantigen genotype J was found significantly more often in emm type 12 isolates. P-values were generated with the two-sided Fisher’s exact test.