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Table 3 Infection titers of a WSSV stock in P. vannamei without and with removal of the peritrophic membrane.

From: Per os infectivity of white spot syndrome virus (WSSV) in white-legged shrimp (Litopenaeus vannamei) and role of peritrophic membrane

Experiment

Inoculation route

Removal of PM

Dilution tissue homogenate

No. of shrimp

Mortality at different time points (hpi)

Infection by IIF

Virus titer

24

36

48

60

72

84

96

120

Total

1

Intramuscular

No

10−6

5

 

2

2

1

    

5/5

5/5

108.5 SID50/mL

No

10−7

5

  

1

2

    

3/5

3/5

 

No

10−8

5

        

0/5

0/5

 

Peroral

No

100

5

  

2

     

2/5

2/5

101.1 SID50/mL

No

10−1

5

        

0/5

0/5

 

No

10−2

5

        

0/5

0/5

 

No

10−3

5

        

0/5

0/5

 

Yes

100

5

 

1

1

     

2/5

2/5

101.3 SID50/mL

Yes

10−1

5

     

1

  

1/5

1/5

 

Yes

10−2

5

        

0/5

0/5

 

Yes

10−3

5

        

0/5

0/5

 

2

Intramuscular

No

10−6

5

 

2

1

2

    

5/5

5/5

108.7 SID50/mL

No

10−7

5

  

2

2

    

4/5

4/5

 

No

10−8

5

        

0/5

0/5

 

Peroral

No

100

5

 

1

      

1/5

1/5

101.2 SID50/mL

No

10−1

5

   

1

    

1/5

1/5

 

No

10−2

5

   

1

    

1/5

1/5

 

No

10−3

5

        

0/5

0/5

 

Yes

100

5

  

1

2

    

3/5

3/5

101.6 SID50/mL

Yes

10−1

5

  

1

     

1/5

1/5

 

Yes

10−2

5

        

0/5

0/5

 

Yes

10−3

5

        

0/5

0/5

 

3

Intramuscular

No

10−6

15

 

2

4

4

4

1

  

15/15

15/15

108.7 SID50/mL

No

10−7

15

 

1

2

4

4

1

  

12/15

12/15

 

No

10−8

15

        

0/15

1/15

 

Peroral

No

100

15

 

1

1

3

    

5/15

5/15

101.1 SID50/mL

No

10−1

15

 

1

      

1/15

1/15

 

No

10−2

15

        

0/15

0/15

 

No

10−3

15

        

0/15

0/15

 

Yes

100

15

 

2

3

2

3

1

  

11/15

11/15

101.7 SID50/mL

Yes

10−1

15

  

2

     

2/15

2/15

 

Yes

10−2

15

        

0/15

0/15

 

Yes

10−3

15

        

0/15

0/15

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