Each year, the viruses that are most likely to cause flu are identified in advance and the World Health Organisation (WHO) recommends which type of flu virus strains to include in the vaccine.

The flu vaccine is the best protection against an unpredictable virus that can cause unpleasant illness in children and severe illness and death among at-risk groups, including older people, pregnant women and those with an underlying medical health condition.

Studies have shown that the flu vaccine will help prevent you getting the flu. It won’t stop all flu viruses and the level of protection may vary, so it’s not a 100% guarantee that you’ll be flu-free, but if you do get flu after vaccination it’s likely to be milder and shorter-lived than it would otherwise have been.