Influenza cases continue to increase


Based on recent influenza surveillance data, influenza is circulating in the community in Ireland. People in at-risk groups are urged to get vaccinated against influenza and it is recommended that antivirals be considered for the treatment and prevention of influenza in at-risk groups due to the continued increase in levels of flu.

Influenza surveillance data
The number of confirmed influenza cases notified to HPSC has increased further in the past week, with 1,174 confirmed influenza cases notified in week 50 (week ending 18th December) compared to 669 cases reported in week 49 (week ending 10th December).

During week 50, 2022, influenza increased in almost all age groups but mainly in those aged 65 years and older. The median age of cases was 39 years (almost one quarter of cases were aged 65 years and older). The overall influenza positivity rate reported from the National Virus Reference Laboratory (NVRL) was 24.1% (98/407) for week 50 2022.

Since October 2022 (season to date), 3,263 confirmed influenza cases have been reported to HPSC. During week 50, 294 hospitalised confirmed influenza cases were reported with 1,003 hospitalised influenza cases notified for the season to date including 25 confirmed influenza cases admitted to critical care units.

Eleven deaths in influenza cases have been notified to HPSC since the beginning of October. Forty-two outbreaks of confirmed influenza have also been reported so far this season. Cases of all three influenza subtypes: influenza A(H1)pdm09, influenza A(H3) and influenza B have been notified. In recent weeks, increases in notified influenza A(H1)pdm09 cases have been seen.

The influenza-like illness (ILI) rate has been above the Irish baseline ILI threshold of 18.1 per 100,000 since week 46 2022. The sentinel GP ILI consultation rate was 66.5 per 100,000 population during week 50 2022 which is above the medium intensity threshold and is an increase compared to the updated rate of 38.6 per 100,000 during week 49 2022.

The latest flu report published each Thursday is available here on the HPSC website. 

Influenza vaccine
The influenza vaccine is available free of charge from GPs and pharmacists for all people in at risk groups. At-risk groups for the influenza vaccine are:

  • All those aged 65 years and older
  • All those aged 2 to 17 years
  • People with chronic illness requiring regular medical follow-up such as chronic lung disease, chronic heart disease, chronic neurological disorders, neurodevelopmental disorders and diabetes
  • Those with lower immunity due to disease or treatment
  • All pregnant women. The vaccine can be given at any stage of pregnancy
  • Those with morbid obesity i.e. Body Mass Index ≥ 40
  • Residents of nursing homes, old people's homes and other long stay facilities
  • Health care workers and carers of those in at-risk groups
  • Those in regular contact with pigs, poultry or waterfowl

See the HSE National Immunisation Office website for further information 

Vaccination remains the most effective means of preventing infection by seasonal influenza viruses and can reduce severe disease that can lead to hospitalisation and death. The vaccine takes two weeks to take effect once received.

What do you do if you have flu-like symptoms
Anyone who gets flu should stay at home, rest, drink plenty of fluids and use over-the-counter remedies like paracetamol to ease symptoms. Advice, tips, information and videos on getting over flu and other common illnesses are available at a new HSE website,

When to seek help

If you are in an at-risk group with flu symptoms OR if you are not in an at-risk group but your flu symptoms are severe or getting worse you should contact your GP. GPs may wish to prescribe antivirals for those presenting with influenza in the at-risk groups. If you need to visit your GP or the Emergency Department, please phone first to explain that you might have flu.

If your child has flu and their symptoms are severe or last for more than one week contact your GP. Please phone first to explain that they might have flu.

Respiratory Hygiene
Covering your cough and sneeze can stop the spread of germs that make people sick.

  • DO use a tissue and place it immediately in the bin. Wash your hands or use a hand sanitizer
  • DO cough or sneeze into your upper sleeve
  • DON’T cough or sneeze into your hands. You’ll end up spreading germs to everything you touch

Posters and social media resources for respiratory hygiene are available to download from the HPSC website.

Influenza-like illness (ILI) GP consultation rates give an indication of the overall community levels of influenza activity in Ireland and are reported by selected GPs as part of a surveillance system jointly run by the Irish College of General Practitioners, the National Virus Reference Laboratory and the Health Protection Surveillance Centre.

The weekly influenza surveillance reports and further information on influenza and flu vaccine are available on the HPSC website.