12 people have died from flu in the Swansea area, according to the latest figures from the Abertawe Bro Morgannwg University Health Board.
It confirmed nine deaths were in hospital and three in the community.
Health bosses also said that 180 people have flu, and there are many more suspected cases.
All four hospitals in the area - Morriston, Singleton, the Princess of Wales in Bridgend and Neath Port Talbot - have flu cases.
ABMU has said that it is 'likely' flu levels will remain high for the next few weeks.
It is urging people who are in at-risk groups and those over the age of 65 to get their free flu jabs if they have not yet had them yet.
- What is Influenza?
Influenza is a respiratory illness caused by a virus that affects the lungs and airways.
- What are the symptoms?
Symptoms generally come on suddenly, and can include fever, chills, headache, cough, body aches and fatigue.
- How does influenza spread?
The influenza virus is spread via droplets which are sprayed into the air when an infected person coughs or sneezes. Direct contact with contaminated hands or surfaces can also spread infection.
It can spread rapidly, especially in closed communities such as hospitals, residential homes and schools.
The influenza viruses that circulate and cause illness each winter change and therefore each year the flu vaccine is changed to try and match the circulating strains.