Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: False rumours of disease outbreaks caused by infectious myonecrosis virus (IMNV) in the whiteleg shrimp in Asia | Senapin et al. Journal of Negative Results in BioMedicine 2011 10 10 http content 10 1 10 r M 1 JOURNAL OF NEGATIVE RESULTS IN BIOMEDICINE RESEARCH Open Access False rumours of disease outbreaks caused by infectious myonecrosis virus IMNV in the whiteleg shrimp in Asia Saengchan Senapin1 2t Kornsunee Phiwsaiya1 2t Warachin Gangnonngiw1 2 and Timothy W Flegel1 2 3 Abstract Background Infectious myonecrosis virus IMNV disease outbreaks in cultivated whiteleg shrimp Penaeus Litopenaeus vannamei are characterized by gross signs of whitened abdominal muscles and by slow mortality reaching up to 70 . In 2006 the first disease outbreaks caused by IMNV in Asia occurred in Indonesia. Since then rumours have periodically circulated about IMNV disease outbreaks in other Asian countries. Our findings indicate that these are false rumours. Findings Our continual testing by nested RT-PCR of shrimp samples suspected of IMNV infection from various Asian countries since 2006 has yielded negative results except for samples from Indonesia. Our results are supported by the lack of official reports of IMNV outbreaks since January 2007 in the Quarterly Report on Aquatic Animal Diseases QAAD from the Network of Aquaculture Centers in Asia Pacific NACA . In most cases our shrimp samples for which tissue sections were possible showed signs of muscle cramp syndrome that also commonly causes muscle whitening in stressed whiteleg shrimp. Thus we suspect that most of the false rumours in Asia about IMNV outside of Indonesia have resulted because of muscle cramp syndrome. Conclusions Results from continual testing of suspected IMNV outbreaks in Asian countries other than Indonesia since 2006 and the lack of official country reports of IMNV outbreaks since January 2007 indicate that rumours of IMNV outbreaks in Asian countries outside of Indonesia are false. We suspect that confusion has arisen because muscle cramp syndrome causes similar signs of whitened tail muscles in whiteleg
