UK Confirms First Human Case of Swine Flu Strain

November 28, 2023

Recently, the UK confirmed its first human case of the swine flu strain, influenza A(H1N2)v, similar to the one circulating in pigs. The infected individual, experiencing respiratory symptoms, has fully recovered from the mild illness, according to UK health officials. The source of the infection is unknown and is currently under investigation. The UK Health Security Agency (UKHSA) is closely monitoring the situation and following up with close contacts of the case. Testing of contacts will be conducted if necessary.

Guidelines for Individuals with Respiratory Symptoms

Individuals experiencing respiratory symptoms are advised to adhere to guidelines provided by UKHSA. This includes avoiding contact with others, especially the elderly or those with pre-existing medical conditions, until symptoms subside.

Enhanced Surveillance Efforts

To enhance the detection of cases and assess transmission, UKHSA is increasing surveillance efforts. Meera Chand, Incident Director at UKHSA, highlighted the role of routine flu surveillance and genome sequencing in detecting the virus. This is the first time the virus has been identified in humans in the UK, although it closely resembles viruses found in pigs.

Investigations and Global Context

Investigations are ongoing to determine how the individual acquired the infection and whether there are any associated cases. Influenza A(H1) viruses are enzootic in swine populations globally. When a swine influenza virus is detected in a person, it is termed a ‘variant influenza virus.’ Swine influenza A viruses, including H1N1, H1N2, and H3N2, are the main subtypes in pigs and can occasionally infect humans through exposure to pigs or contaminated environments.

Global Cases and UK Context

The UK Health Security Agency reported a total of 50 human cases of influenza A(H1N2)v globally since 2005. However, this strain has not been previously detected in humans in the UK. Investigations will continue to provide insights into the origin and implications of this rare case.

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