A campaign has got underway today to encourage people to get the seasonal flu jab.
The Chief Medical Officer, Ruth Hussey, is encouraging people in "at risk" groups and over the age of 65 to have the vaccination.
Flu can cause serious illness and could be life threatening, especially for the elderly, pregnant women and those with existing medical conditions.
The Chief Medical Officer for Wales, Dr Ruth Hussey, launches the seasonal flu campaign today.
It is hoped that more people will be encouraged to take up the jab, especially those in 'At Risk' groups and people aged 65 and over.
People in 'at-risk' groups are offered the injection currently, but the take-up is lower in Wales than the rest of the UK.
The number of people in Wales taking up free flu jabs is lower than in England, Ireland and Scotland.
Only half the people who are classed as most at risk of getting serious complications are protecting themselves from it.
Now doctors here are calling for more people to have a flu vaccination.
Our Health Correspondent Mariclare Carey-Jones has been investigting