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
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The Newsweek Quiz - where we will be testing your knowledge from the last seven days of news here in Wales.