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| The way of water: unravelling White Spot Syndrome Virus (WSSV) transmission dynamics in Litopenaeus vannamei shrimp Cox, N.; De Swaef, E.; Corteel, M.; van den Broeck, W.; Bossier, P.; Dantas-Lima, J.J.; Nauwynck, H.J. (2023). The way of water: unravelling White Spot Syndrome Virus (WSSV) transmission dynamics in Litopenaeus vannamei shrimp. Viruses 15(9): 1824. https://dx.doi.org/10.3390/v15091824
In: Viruses. MDPI: Basel. e-ISSN 1999-4915
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| Abstract |
White spot disease (WSD) is a severe viral threat to the global shrimp aquaculture industry. However, little is known about white spot syndrome virus (WSSV) transmission dynamics. Our aim was to elucidate this in Litopenaeus vannamei using peroral in vivo WSSV challenge experiments. We demonstrated that WSD progression was rapid and irreversible, leading to death within 78 h. Viral DNA shedding was detected within 6 h of disease onset. This shedding intensified over time, reaching a peak within 12 h of the time of death. Isolating shrimp (clinically healthy and diseased) from infected populations at different time points post-inoculation showed that host-to-host WSSV transmission was occurring around the time of death. Exposing sentinels to environmental components (i.e., water, feces, molts) collected from tanks housing WSSV-infected shrimp resulted in a significantly (p-value < 0.05) increased infection risk after exposure to water (1.0) compared to the risk of infection after exposure to feces (0.2) or molts (0.0). Furthermore, ingestion of WSSV-infected tissues (cannibalism) did not cause a significantly higher number of WSD cases compared to immersion in water in which the same degree of cannibalism had taken place. |
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