Wednesday, December 27, 2017

South Korea: Pathogenicity Testing Of Gochang Reassorted H5N6 Virus


On November 17th South Korea's MAFRA Confirmed HPAI H5N6 At Gochang Poultry Farm - the first such outbreak of the fall - and 10 days later announced the virus was not the Asian H5N6 which had first visited a year earlier, but rather a New Reassortant Virus, spun off from the the H5N8 virus that ravaged Europe last winter. 
Since then a second `strain' of this new reassortant had been reported from Yeongam. Since November we've seen several more duck farms hit, and multiple detections of H5 viruses in environmental samples around the country. 
While these viruses have carried the genetic signature indicative of an HPAI virus, it requires actual testing on poultry to determine its pathogenesis, course of illness, and mortality rate. 

Today we've a brief announcement on the results of such testing on the first (Gochang) strain of the virus, which finds the virus spreads quickly and  inoculated chickens die rapidly (2.2 days), and the virus is comparable to both H5N1 and the Asian H5N6 virus in lethality.
It is confirmed that the virus is high virus, high virulence virus and pathogen.

As a result of evaluating the pathogenicity of H5N6 type AI virus isolated from Gochang, Jeonbuk Province on Nov. 17, 100% of the infected chickens were infected with nasal intoxication of Jeonbuk Gochang virus, and the mortality rate was very fast (average lethal time 2.2 * 

The World Animal Health Organization (OIE) requires that chickens be used for the evaluation of AI virus pathogenicity. ¢ The Gochang Virus is an H5N1 virus And H5N6 type, and the pathogenicity and spreading power of chicken were high

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