Infectivity and Transmissibility of Acute Hepatopancreatic Necrosis Disease Associated <i>Vibrio parahaemolyticus</i> in Frozen Shrimp Archived at −80 °C

oleh: Chorong Lee, Hye Jin Jeon, Bum Keun Kim, Seong-Kyoon Choi, Sumi Kim, Gwang Il Jang, Ji Hyung Kim, Jee Eun Han

Format: Article
Diterbitkan: MDPI AG 2022-05-01

Deskripsi

Acute hepatopancreatic necrosis disease (AHPND) caused by <i>Vibrio parahaemolyticus</i> (<i>Vp</i><sub>AHPND</sub>) has been reported in commodity shrimp, but the potential risk of its global spread via frozen shrimp in the shrimp trade is yet to be fully explored. We hypothesized that frozen shrimp with AHPND could be a source of <i>Vp</i><sub>AHPND</sub> transmission; thus, the infectivity of frozen shrimp with AHPND was evaluated using a shrimp bioassay. To prepare infected frozen shrimp, 12 <i>Penaeus vannamei</i> (average weight, 2 g) were exposed to <i>Vp</i><sub>AHPND</sub> by immersion in water with a <i>Vp</i><sub>AHPND</sub> concentration of 1.55 × 10<sup>7</sup> CFU mL<sup>−1</sup>; once dead, the shrimp were stored at −80 °C for further analysis. After two weeks, a PCR assay was used to confirm AHPND positivity in frozen shrimp (<i>n</i> = 2), and <i>Vp</i><sub>AHPND</sub> was reisolated from the hepatopancreases of these shrimp. For the infectivity test, 10 <i>P. vannamei</i> (average weight, 4 g) were fed with the hepatopancreases of <i>Vp</i><sub>AHPND</sub> -infected frozen shrimp (<i>n</i> = 10). After feeding, 70% of the shrimp died within 118 h, and the presence of <i>Vp</i><sub>AHPND</sub> was confirmed using a PCR assay and histopathology examination; moreover, <i>Vp</i><sub>AHPND</sub> was successfully reisolated from the hepatopancreases of the dead shrimp. We are the first to evaluate the potential transmissibility of <i>Vp</i><sub>AHPND</sub> in frozen shrimp, and our results suggest that frozen shrimp with AHPND are a potential source of disease spreading between countries during international trade.