With the number of flu victims on the rise this winter, the HSE is urging people to take care not to catch the virus, and if you do, not to pass it on.
The number of people consulting their GP about the flu has doubled over the Christmas season, with the over 65s, children under two and pregnant women being among the most vulnerable.
Those who have contracted the virus are urged to stay indoors, drink plenty of fluids, and to stay away from visiting hospitals and nursing homes.
The HSE is also reminding people not to take antibiotics to combat the virus, as they simply won't work.
Symptoms that you have caught the virus include dry coughs, headaches, stiff muscles and joints, and in extreme cases, vomiting and diarrhoea.
Experts say influenza spreads through coughing sneezing, and even talking, so if you think you've got the virus, you are advised to cough or sneeze into a tissue, sleeve or even elbow, and to keep washing your hands.