Abstract
Highly pathogenic avian influenza viruses (HPAIVs) A(H5N6) were concurrently introduced into several distant regions of Japan in November 2016. These viruses were classified into the genetic clade 2.3.4.4c and were genetically closely related to H5N6 HPAIVs recently isolated in South Korea and China. In addition, these HPAIVs showed further antigenic drift.
Highlights
Pathogenic avian influenza viruses (HPAIVs) A(H5N6) were concurrently introduced into several distant regions of Japan in November 2016
For HA antigenic characterization, we investigated the reactivity of chicken antiserum raised against several H5 isolates to our H5N6 Highly pathogenic avian influenza viruses (HPAIVs) isolates using the hemagglutination inhibition test [14]
None of the antiserum samples tested reacted strongly with A/black swan/Akita/1/2016 (H5N6) except for the homologous antiserum. These results indicate that the HA antigenicity of the H5N6 HPAIVs recently introduced in Japan differ appreciably from those of the previous H5Nx viruses
Summary
Pathogenic avian influenza viruses (HPAIVs) A(H5N6) were concurrently introduced into several distant regions of Japan in November 2016. While this bird’s specimens underwent further analysis, another influenza virus was isolated from a water sample collected at an overwintering site of migratory birds in Kagoshima Prefecture at the southern tip of Japan on November 14, 2016 (Table 1). A fecal sample of a common teal (Anas crecca) collected at an overwintering site of migratory birds in Tottori Prefecture in the middle of Japan on November 15, 2016, was reported to harbor an H5N6 HPAIV, A/teal/Tottori/1/2016 (H5N6) (Table 1).
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