ArticleInternational microbiology : the official journal of the Spanish Society for Microbiology2024
Genetic and morphological characterization of a new genotype of nervous necrosis virus circulating among Nile tilapia in the south of Egypt.
Article in International microbiology : the official journal of the Spanish Society for Microbiology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 7 citations in OpenAlex.
- Identification and characterization of a Nervous Necrosis Virus (NNV) isolated from tilapia (Oreochromis niloticus) in China.Archives of virology · 2026Article
- The multifaceted challenge of viral nervous necrosis in fish farming: a review of current knowledge and control.Veterinary research communications · 2026Review
- Emergence of multidrug-resistant Staphylococcus epidermidis in Nile tilapia (Oreochromis spp.): virulence, antimicrobial resistance, and nanoparticle-based control.BMC veterinary research · 2026Article
- Dynamic changes in postmortem quality of grass carp (Food chemistry: X · 2024Article
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
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Abstract
Nervous necrosis virus (NNV) is the causative agent of viral nervous necrosis in freshwater and marine fishes. In this study, NNV circulating among wild and farmed Nile tilapia (Oreochromis niloticus) was genetically and morphologically characterized using reverse transcription polymerase chain reaction (RT-PCR), sequencing analysis, and transmission electron microscopy (TEM). Brain, eye, and other organ (spleen, kidney, heart, and liver) specimens were collected from 87 wild (66) and farmed (21) Nile tilapia fish during their adult or juvenile stage at different localities in Qena and Sohag governorates in southern Egypt. Among them, 57/87 fish showed suspected NNV clinical signs, and 30/87 were healthy. The results revealed that NNV was detected in 66 out of 87 fish (58.62% in the wild and 17.24% in farmed Nile tilapia by RT-PCR), and the prevalence was higher among diseased (55.17%) than in healthy (20.69%) fish. NNV was detected in the brain, eye, and other organs. Using TEM, virion size variations based on the infected organs were observed. Nucleotide sequence similarity indicated that NNVs had a divergence of 75% from other fish nodaviruses sequenced in Egypt and worldwide. Phylogenetic analysis distinguished them from other NNV genotypes, revealing the emergence of a new NNV genotype in southern Egypt. In conclusion, NNV is circulating among diseased and healthy Nile tilapia, and a new NNV genotype has emerged in southern Egypt.
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