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. 2020 Mar 24;82(3):394-398.
doi: 10.1292/jvms.18-0737. Epub 2020 Jan 22.

Virulence of infectious pancreatic necrosis virus (IPNV) isolates from Mexico

Celene Salgado-Miranda  1   2 , Edith Rojas-Anaya  3 , Gary García-Espinosa  4 , Elizabeth Loza-Rubio  3
Affiliations

Virulence of infectious pancreatic necrosis virus (IPNV) isolates from Mexico

Celene Salgado-Miranda et al. J Vet Med Sci. .

Abstract

Infectious pancreatic necrosis virus (IPNV) causes economic losses in Mexican rainbow trout industry. In this study, virulence and genetic fingerprints of Mexican IPNV isolates was investigated for the first time. Two Mexican IPNV isolates were analyzed in rainbow trout fry and the Sp strain was included as high virulence. One of the Mexican IPNV isolate was obtained from diseased fish and the other from fish without clinical signs. The infection was performed using a standardized immersion. Clinical signs were observed at 4 days post infection in fry group infected with strain Sp, two days earlier than in trout infected with IPNV isolates Mexican. Severe lesions were found in 100% of the individuals of Sp group, but only in 25% of each isolated Mexican group. Results suggest that Mexican IPNV isolates are pathogenic, but less virulent than strain Sp. The amino acid motif residues of both Mexican isolates, corresponded to a subclinical disease. Nevertheless, the accumulated motility observed in the field, suggest that other factors play a role in the virulence of the disease.

Keywords: Mexico; genetic fingerprints; infectious pancreatic necrosis virus (IPNV); rainbow trout; virulence.

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Figures

Fig. 1.
Fig. 1.
Fish at 8 day post infection (dpi): Fish up with pale liver (Sp group) and fish below with normal liver (Control negative group).
See this image and copyright information in PMC

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