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Influenza

Influenza is a widespread viral illness that can be fatal. The spread of influenza can be contained by vaccination, but the virus causes many deaths worldwide each year.
The emergence of a pandemic strain of influenza virus is an ongoing global health concern. Our research is revealing the dual roles of the immune system in preventing influenza infection, and contributing to serious influenza symptoms.
Our influenza research
Our research into influenza is focused on understanding how the immune system responds to the infection. Our researchers are focusing on
- Understanding how immunity to influenza develops.
- Revealing how inflammation worsens illness from influenza infection.
- Discovering new strategies to improve immunity to influenza, and how illness is treated.
What is influenza?
Influenza is an infectious disease caused by viral infection of the cells lining the nose, throat and lungs. The influenza virus lives and reproduces within cells, causing symptoms including:
- A high fever
- Headache and body aches
- Extreme fatigue
- Coughing, nasal discharge and sneezing
Influenza can cause serious, potentially fatal, complications including:
- Lung disease, and subsequent bacterial infections
- Heart inflammation and failure
- Brain and liver inflammation, a condition called Reye syndrome
Many of the symptoms of influenza are a consequence of the immune response to the influenza infection.
Influenza occurs when the influenza virus is inhaled. It can be spread between people, or, in some strains, from animals such as birds or pigs, to humans.
Different strains of influenza virus exist. These have different severity and infect different species. Most human influenza is caused by the ‘influenza A’ virus. Influenza strains can be distinguished by variations in two surface proteins called haemagglutinin (H) and neuraminidase (N).
Influenza strains differ in the species they infect – some influenza viruses cannot infect humans. They also differ in the severity of their disease.
Influenza occurs more frequently in cooler months. This is termed ‘seasonal influenza’. Each year, different strains of influenza virus occur. Exposure to these viruses leads to people becoming immune to them – they are protected against a second infection.
Occasionally a strain of influenza emerges that spreads more widely and causes more serious disease and death. This is called ‘pandemic influenza’. Factors enabling a influenza virus causing a pandemic include:
Emergence of a new influenza virus strain that few people have already established immunity to.
The virus triggering a larger-than-usual immune response, which causes illness and death, particularly in young, otherwise healthy people.
Illness and death from influenza are a substantial global health burden. There are more than 500,000 influenza-related deaths annually. Previous influenza pandemics have claimed the lives of millions of people in one or two years.
Who is at risk of serious influenza illness?
Some people are at elevated risk of serious illness from influenza infection. These include:
- Young children
- Older people
- Pregnant women
- People with a weakened immune system, such as people infected with HIV
- People with diabetes
- People with other chronic diseases including heart disease and lung disease
Outbreaks of pandemic influenza often cause death in young, otherwise healthy adults. This may be because pandemic influenza triggers a harmful immune response.
How is influenza prevented?
Influenza can be prevented by vaccination. Current vaccines can only trigger protective immune responses to individual strains of influenza virus, not all strains. For this reason, influenza vaccination does not offer lifelong immunity and annual vaccination is required.
Influenza spread can be reduced by good hygiene, and by avoiding contact with infected people.
The World Health Organization and government agencies oversee influenza surveillance programs to enable early responses to new strains of influenza to reduce the spread of the virus and prevent pandemics.
How is influenza treated?
Antiviral medications are available to treat influenza infections. These block the entry of the virus into cells and can reduce symptoms if given early in the illness.
Researchers:
Super Content:
A protein called SOCS4 has been shown to act as a handbrake on the immune system’s runaway reaction to flu infection, providing a possible means of minimising the impact of flu pandemics.
Our researchers have defined for the first time how the size of the immune response is controlled during infection, or in response to vaccination.