Confirmatory test of active IHHNV infection in shrimp by immunohistochemistry and IHHNV-LongAmp PCR
Issued Date
2023-01-01
Resource Type
ISSN
01407775
eISSN
13652761
Scopus ID
2-s2.0-85179360019
Journal Title
Journal of Fish Diseases
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Fish Diseases (2023)
Suggested Citation
Imsonpang S., Pudgerd A., Chotwiwatthanakun C., Srisala J., Sanguanrut P., Kasamechotchung C., Sritunyalucksana K., Taengchaiyaphum S., Vanichviriyakit R. Confirmatory test of active IHHNV infection in shrimp by immunohistochemistry and IHHNV-LongAmp PCR. Journal of Fish Diseases (2023). doi:10.1111/jfd.13905 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/91526
Title
Confirmatory test of active IHHNV infection in shrimp by immunohistochemistry and IHHNV-LongAmp PCR
Other Contributor(s)
Abstract
The presence of endogenous viral elements (EVE) in the penaeid shrimp genome has been recently reported and suggested to be involved in the host recognition of viral invaders. Our previous report of a search for EVE of infectious hypodermal and haematopoietic necrosis virus (IHHNV-EVE) in the Thai Penaeus monodon whole genome sequence project (GenBank accession no. JABERT000000000) confirmed the presence of three clusters of EVE derived from IHHNV in the shrimp genome. This study aimed to compare an immunohistochemistry method (IHC) and a PCR method to detect infectious IHHNV infection in shrimp. First, specimens collected from farms were checked for IHHNV using three PCR methods; two methods were recommended by WOAH (309 and 389 methods), and a newly established long-range PCR for IHHNV (IHHNV-LA PCR) targeting almost the whole genome (>90%) of IHHNV. Among 29 specimens tested, 24 specimens were positive for WOAH methods (at least one method). Among 24 WOAH-positive specimens (WOAH+), there were 18 specimens with positive IHHNV-LA PCR method (WOAH+/LA+), six specimens with negative IHHNV-LA PCR method (WOAH+/LA−). Six specimens were negative for all methods (WOAH−/LA−). The positive signals detected by IHC method were found only in the specimens with WOAH+/LA+. The results suggest that the WOAH+/LA− specimens were not infected with IHHNV, and the positive WOAH method might result from the EVE-IHHNV. The study recommends combining the IHHNV-LA PCR method and IHC with positive PCR results from WOAH's recommended methods to confirm IHHNV infection.