The observation states that The H5 exceptionally pathogenic avian flu infections (HPAIVs) of clade 2.3.4.4 are of extraordinary concern due to their worldwide spread and dissemination. Sufficient proof shows that clade 2.3.4.4 H5 infections determined neuraminidase (NA) quality from other low-pathogenicity avian flu infections (LPAIVs) co-coursing in transient birds, and new subtypes of H5N2, H5N5, H5N6, and H5N8 HPAIVs have been distinguished in wild bird species and poultry around the world (1,2). Until this point, H5 infections of clade 2.3.4.4 have advanced into 8 subclades (2.3.4.4a to 2.3.4.4h) as per the World Health Organization’s (WHO) classification framework (1). Among them, H5N6 is the just subtype that has caused human contaminations. As of August 2019, a sum of 24 human cases have been accounted for to WHO; the death rate is 67%.
H5N6 infection of subclade 2.3.4.4a was first identified in poultry in Laos in 2013, at that point spread to Vietnam and China and caused various cases here. H5N8 infection of subclade 2.3.4.4b caused illness episodes in wild birds and poultry in Korea in 2014, at that point spread to North America through bird movement and set up another subclade, 2.3.2.4c. At the point when the H5N8 infection of subclade 2.3.4.4b arrived in Europe and Africa, it reassorted with the neighborhood LPAIV and delivered H5N6 with a novel inner quality tape in 2017.
Reference link- https://wwwnc.cdc.gov/eid/article/26/12/20-1201_article
