Analysis of number of compound repeat units in ORF94 of white spot syndrome virus isolated from Litopenaeus vannamei from outbreak and non-outbreak shrimp farms in Sonora, Mexico.

Libia Zulema Rodriguez-Anaya, Jose Cuauhtemoc Ibarra-Gamez, Fernando Lares-Villa, Ramon Casillas-Hernandez, Alejandro Sanchez-Flores, Jose Reyes Gonzalez-Galaviz


DOI: https://doi.org/10.3856/vol44-issue4-fulltext-21

Abstract


White spot syndrome virus (WSSV) is the viral pathogen with the most negatively impact on shrimp farming. In Sonora, Litopenaeus vannamei culture has decreased 50% during 2010-2012 due to WSSV outbreaks. The ORF94 has proven to be most useful for analysis of WSSV variability, several studies have suggested a correlation between its Repeat Units (RUs) and WSSV virulence as follows: the fewer RUs (<9) the higher mortality rate. For support this, we analized shrimp from 8 farm periods and identified the WSSV-variety present in each one. In outbreaks was notable the presence of <8 RUs with a dominance of 3 RUs in the last 4 years. Although is still not clear yet, how host-virus interactions and the pond environment affect the transition of the infection from just the presence of the virus in shrimps to an outbreak, these results are a step forward in understanding the pond status and ways of predicting the like hood of a WSSV infection would become an outbreak.


Rodriguez-Anaya L, Ibarra-Gamez J, Lares-Villa F, Casillas-Hernandez R, Sanchez-Flores A, Gonzalez-Galaviz J. Analysis of number of compound repeat units in ORF94 of white spot syndrome virus isolated from Litopenaeus vannamei from outbreak and non-outbreak shrimp farms in Sonora, Mexico.. Lat. Am. J. Aquat. Res.. 2017;44(4). Available from: doi:10.3856/vol44-issue4-fulltext-21 [Accessed 22 Jan. 2019].
Rodriguez-Anaya, L., Ibarra-Gamez, J., Lares-Villa, F., Casillas-Hernandez, R., Sanchez-Flores, A., & Gonzalez-Galaviz, J. (2017). Analysis of number of compound repeat units in ORF94 of white spot syndrome virus isolated from Litopenaeus vannamei from outbreak and non-outbreak shrimp farms in Sonora, Mexico.. Latin American Journal of Aquatic Research, 44(4). doi:http://dx.doi.org/10.3856/vol44-issue4-fulltext-21