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Yellow head virus (YHV) is a highly virulent pathogen of Penaeus monodon shrimp. It is one of six known genotypes in the yellow head complex of nidoviruses which also includes mildly pathogenic gill-associated virus (GAV, genotype 2) and four other genotypes (genotypes 3–6) that have been detected only in healthy shrimp. In this study, comparative phylogenetic analyses conducted on replicase- (ORF1b)...
Yellow head virus (YHV) is a highly virulent pathogen of penaeid shrimp. An isolate obtained from Penaeus vannamei during a yellow head disease outbreak in February 2006 in Ratchaburi Province, Thailand was purified following passage in experimentally infected shrimp. SDS-PAGE of purified virions indicated that envelope glycoprotein gp116 in the Ratchaburi/2006 isolate was smaller and relatively less...
Penaeus monodon shrimp collected from across the Indo-Pacific region during 1997–2004 were screened for the presence of yellow head-related viruses. Phylogenetic analyses of amplified ORF1b gene segments identified at least six distinct genetic lineages (genotypes). Genotype 1 (YHV) was detected only in shrimp with yellow head disease. Genotype 2 (GAV) was detected in diseased shrimp with the less...
Yellow head virus (YHV) is an invertebrate nidovirus that is highly pathogenic for marine shrimp. Nucleotide sequence analysis indicated that the YHV ORF2 gene encodes a basic protein (pI=9.9) of 146 amino acids with a predicted molecular weight of 16,325.5Da. The deduced amino acid sequence indicated a predominance of basic (15.1%), acidic (9.6%) and hydrophilic polar (34.3%) residues and a high...
A multiplex RT-nested PCR has been developed to detect and differentiate the closely related prawn viruses, gill-associated virus (GAV) from Australia and yellow head virus (YHV) from Thailand. RT-PCR using primers to conserved sequences in the ORF1b gene amplified a 794bp region of either GAV or YHV. Nested PCR using a conserved sense primer and either a GAV- or YHV-specific antisense primer to a...
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