In Suffolk, at the end of October, 48.6% of over 65s had accepted the jab compared with 53.6% last year. Whereas 25.1% of under 65s in at risk groups had accepted it against 27.9% last year.

Experts are taking no chances and want to urge patients to check if they are eligible and make sure they contact their GP surgery to have it if they need it.

Dr Victoria Fearne, NHS Suffolk’s public health registrar said: “If you are called up for a flu vaccination, or think you need one, we urge you to take advantage of the opportunity and contact your surgery.”

Those at risk who are eligible for the vaccination include adults and children between six months and 65 years old, who suffer from heart or chest diseases, or diabetes. Typically, fewer than half those under 65 in at-risk groups take advantage of the free jab, leaving thousands vulnerable.

All people aged 65 and over qualify for the free annual seasonal flu jab. In addition, adults and children aged six months to 65 years who have the following conditions are deemed to be at risk and should contact their GP for the free jab:

– Chronic respiratory disease, including asthma
– Chronic heart disease
– Chronic renal disease
– Chronic liver disease
– Diabetes requiring insulin or oral hypoglycaemic drugs
– Immunosuppression
– Women who are pregnant

Dr Fearne continued: “It is vital that people do not underestimate just how serious the effects of the flu virus can be. It is not like catching a cold”.

People who had the seasonal flu vaccination last year will need a new seasonal flu jab this winter. This is because the main circulating flu strains change every year and the vaccine needs to match the latest strains.

Your GP surgery will invite you for your seasonal flu vaccination. If you haven’t been invited yet, contact your GP surgery for more information, or visit www.nhs.uk/flu

Other groups eligible for seasonal flu vaccination include:

· Those who live in a residential or nursing home

· The main carers of elderly or disabled people

· Healthcare or social care professionals directly involved in patient care

· Poultry workers