Human Swine Flu Case Confirmed in the UK

The U.K. Health Security Agency (UKHSA) announced today that it has detected a confirmed human case of influenza A(H1N2)v, known as swine flu.

Influenza A(H1) viruses are enzootic in swine populations in most regions of the world. There have been a total of 50 human cases of influenza A(H1N2)v reported globally since 2005.

In August 2023, the U.S. confirmed a human infection with a novel influenza A(H1N2) variant virus in Michigan. 

This is the first Influenza A(H1N2)v detection of this flu strain in a human in the U.K. 

The individual concerned experienced a mild illness and has fully recovered.

The individual was tested by their G.P. after experiencing respiratory symptoms. Influenza A(H1N2)v virus was detected by UKHSA using polymerase chain reaction testing and characterized using genome sequencing. 

The source of their infection has not yet been ascertained and remains under investigation. Close contacts of the case are being followed up by UKHSA and partner organizations.

Any contacts will be offered testing as necessary and advised on any necessary further care if they have symptoms or test positive.

The case was detected as part of routine national flu surveillance undertaken by UKHSA and the Royal College of General Practitioners.

Chief Veterinary Officer Christine Middlemiss commented in a press release on November 27, 2023, "We know that some diseases of animals can be transferred to humans – which is why high standards of animal health, welfare, and biosecurity are so important."

"In this case, we are providing specialist veterinary and scientific knowledge to support the UKHSA investigation. Pig keepers must also report any suspicion of swine flu in their herds to their local vet immediately."

As of 2023, the U.S. FDA and the U.K have not approved a swine flu vaccine.