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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)

From: Circulatory white spot syndrome virus in South-West region of Bangladesh from 2014 to 2017: molecular characterization and genetic variation

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