Transmission Routes and a New Freshwater Crustacean Host for Infectious Precocity Virus (IPV).

holds significant importance in aquaculture within tropical and subtropical regions globally. An infection called infectious precocity virus disease (IPVD), caused by infectious precocity virus (IPV), has emerged in in China and causes significant economic losses. The diseased presents with the characteristics of sexual precocity and slow growth. Elaborating the route of transmission and host range of IPV is necessary to prevent the disease. Transmission of IPV to healthy can occur through the ingestion of IPV-infected tissue, immersion of viral filtrate, cohabitation with infected , or water-borne transmission in contaminated environment. Results showed that fertilized eggs and different growth and development stages (larvae Ⅰ-Ⅵ, postlarvae, juveniles, and adult prawns) from infected were negative for IPV, indicating that vertical transmissions did not occur. The results of artificial infection experiments showed that tested positive for the presence of IPV, but not in fishes , , , and , and crabs and . IPV could cause slow growth in and mainly infected the second pereiopod, brain, eyes, and gills of was found to be a new freshwater crustacean host for IPV. From December 2019 to March 2022, 260 samples in four regions were collected, including 230 IPV-positive samples according to nested PCR and 40 IPV-negative samples according to nested PCR. These findings could aid in preventing and managing IPV infections in crustaceans.