Flu in Ireland — Vaccine, Symptoms & Treatment Guide

Flu in Ireland

Seasonal influenza causes significant illness and hospitalisation in Ireland every winter, with peak activity typically between December and March. Per HPSC surveillance, several thousand people are hospitalised in a typical season, with several hundred ICU admissions and deaths — disproportionately in older adults and those with chronic conditions. Vaccination is the most effective prevention.

Flu vs cold — how to tell

Per NICE CKS:

• Flu: sudden onset, high fever (38°C+), severe muscle/joint aches, marked fatigue, dry cough, headache. "Can't get out of bed" feeling.
• Cold: gradual onset, mild fever or no fever, runny nose, sneezing, sore throat. Usually still functional.

Most healthy adults recover from flu in 7-10 days with supportive care.

The HSE-funded flu vaccine programme

Per the HSE National Immunisation Office, vaccine is offered free of charge to those at higher risk of complications:

• Adults aged 65 and over
• Children aged 2-17 (offered via nasal spray)
• Pregnant women at any stage
• People with chronic conditions — heart, lung, kidney, liver, neurological disease; diabetes; immunosuppression; obesity (BMI 40+); haematological conditions
• Healthcare workers and home carers
• People living in long-term residential care
• Household contacts of those at higher risk

Most pharmacies and treating doctors administer the flu vaccine in Ireland. Vaccine should ideally be given in October-November before peak season; later is still worthwhile.

If you do get flu

Supportive care is the main approach for most healthy adults:

• Rest — don't push through
• Fluids
• Paracetamol or ibuprofen for fever and aches
• Stay home — flu is contagious from before symptoms start through about a week after
• Hand hygiene

Antiviral treatment — selective

Oseltamivir (Tamiflu) is reserved for higher-risk patients or those with severe disease. Per NICE and ICGP guidance, it is most effective when started within 48 hours of symptom onset. It modestly shortens illness and reduces complications in higher-risk groups. Not routinely recommended for healthy adults with uncomplicated flu.

When to seek urgent care

Most flu is managed at home. Seek same-day or emergency care for any of:

• Difficulty breathing or shortness of breath
• Chest pain
• Severe dehydration (unable to keep fluids down, very reduced urine output)
• Sudden dizziness, confusion, or weakness
• Symptoms improving then suddenly worsening with high fever and worse cough (secondary bacterial pneumonia)
• Persistent very high fever not controlled by paracetamol/ibuprofen
• Signs of sepsis (per HSE Sepsis Six)
• Very young children with flu signs — particularly under 1 year

Online Doctor consultation

Useful for: assessing whether antiviral treatment is appropriate for you, prescription within the treatment window, advice on managing symptoms at home, sick certs for time off work. For severe symptoms or red flags, in-person or emergency assessment is the right pathway.