Table 1 The potential severity of WSSV infection in farmed shrimp was evaluated by the laboratory based severity study of Walker et al. (2011) and Tang and Lightner (2000)
Category of Severity of WSSV infection in Shrimp | Severity of WSSV infection in shrimps from January 2014 to June 2017 | ||
|---|---|---|---|
CT value | Level of infection | Total (n = 120) | % of samples |
According to Walker et al. (2011) | |||
 < 24.33 | Heavy | 37 | 30.83 |
 28.33–24.33 | Moderate | 36 | 30 |
 31.52–28.33 | Light | 11 | 9.17 |
 34.82–31.52 | Very little | 10 | 8.33 |
 > 34.82 | Negative | 26 | 21.67 |
WSSV load/g shrimp tissue | Severity level | Total (n = 120) | % of samples |
|---|---|---|---|
According to Tang and Lightner (2000) | |||
 2.0 × 105 | G1-mild | 0 | 0 |
 2.0 × 107 | G2-mild to moderate | 7 | 5.83 |
 2.0 × 109 | G3-moderate to severe | 74 | 61.67 |
 2.0 × 1011 | G4-severe | 13 | 10.83 |
 No load | Negative | 26 | 21.67 |