H5N1 remains a major threat to poultry and wild bird populations, leading to large-scale culling of domestic fowl in many countries over the past few years to control outbreaks and reduce economic losses. The virus has caused a dramatic rise in bird infections worldwide, particularly in Asia, Europe and North America, throughout 2022 and 2023.

The Centers for Disease Control and Prevention today released an advisory recommending clinicians expedite subtyping of type A influenza samples from hospitalized patients, particularly individuals in an intensive care unit.

The US Centers for Disease Control and Prevention is urging hospitals to accelerate advanced testing of people they suspect may have bird flu.

"The Chinese poultry lineage may have experienced more vaccine-driven selection compared to other lineages," the researchers wrote.

A case of the bird flu (also known avian flu or H5N1) involving gamebirds has been confirmed in Spartanburg. The virus was first detected on Dec. 31 and has not been transmitted elsewhere in the Carolinas, the Centers for Disease Control (CDC) reports.

A subtype of bird flu caused by avian influenza A (H5) virus has been spreading worldwide ... including avian influenza A(H5N1), have gained the ability to spread easily and sustainably among ...

The findings come at a time when outbreaks of bird flu -- a different subtype of the ... of the highly pathogenic avian influenza (HPAI) H5N1 influenza virus currently circulating

This pathogenic avian influenza A is a subtype that is found in cows ... with highly pathogenic avian influenza (HPAI) A, H5N1 virus that primarily causes bird flu, has a high potential for ...