Quantitative relationship of two viruses (MrNV and XSV) in white-tail disease of Macrobrachium rosenbergii.
Dis Aquat Organ
; 71(1): 11-7, 2006 Jul 11.
Article
in En
| MEDLINE
| ID: mdl-16921996
ABSTRACT
Macrobrachium rosenbergii nodavirus (MrNV) and extra small virus (XSV) were purified from diseased freshwater prawns M. rosenbergii and used to infect healthy post-larvae (PL) by an immersion method. Three groups of prawns were challenged with various combined doses of MrNV and XSV. Signs of white-tail disease (WTD) were observed in Groups 1 and 2, which had been challenged with combinations containing relatively high proportions of MrNV and low proportions of XSV. By contrast there was little sign of WTD in Group 3, which had been challenged with a higher proportion of XSV than MrNV. A 2-step Taqman real-time RT-PCR was developed and applied to quantify viral copy numbers in each challenged PL. Results showed that genomic copies of both viruses were much higher in Groups 1 and 2 than they were in Group 3, indicating that MrNV plays a key role in WTD of M. rosenbergii. The linear correlation between MrNV and XSV genome copies in infected prawns demonstrated that XSV is a satellite virus, dependent on MrNV, but its role in pathogenicity of WTD remains unclear.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Reverse Transcriptase Polymerase Chain Reaction
/
Nodaviridae
/
Palaemonidae
Type of study:
Diagnostic_studies
Limits:
Animals
Language:
En
Journal:
Dis Aquat Organ
Journal subject:
BIOLOGIA
/
MEDICINA VETERINARIA
/
MICROBIOLOGIA
Year:
2006
Document type:
Article
Affiliation country:
China