Last reviewed: June 2026 · Republic of Ireland · 01 9036408

How long do I have to claim for a hospital infection in Ireland?

Two years is the general limit, and for a personal injury claim of this kind that period is often stated as two years less one day. The deadline comes from section 3 of the Statute of Limitations (Amendment) Act 1991,^[1] which originally set a three-year period but was amended to two years by section 7 of the Civil Liability and Courts Act 2004 with effect from 31 March 2005.^[2] Knowing the deadline is the first step in deciding whether you can still pursue compensation for injury in Ireland after an infection.

The complication is the start date. For many injuries the clock starts on the day the harm happens. A hospital-acquired infection is different, because the infection, and the realisation that it may have been caused by a failure in care, can emerge well after your hospital stay. That is why the date of knowledge matters so much here, and why the rest of this page focuses on it.

One myth is worth correcting at the outset. The Irish limit is two years, not three. Some guidance, often written for England and Wales, where the limit is three years, states a three-year figure that does not apply in Ireland. A three-year limit for clinical negligence was legislated here but has never been brought into force, so the rules across all medical claims still run on two years. For those general rules, our medical negligence time limits page is the fuller guide. This page applies them to infections.

Why the "date of knowledge" is often later in hospital infection cases

Your date of knowledge is when you first knew four things, not simply when you tested positive for an infection. Under section 2 of the 1991 Act,^[1] the clock starts when you first knew, or ought reasonably to have known, that you had suffered an injury, that the injury was significant, that it was attributable to an act or omission, and the identity of the responsible party.

The third element is the one that delays the clock in infection cases. An infection can be caught in hospital with no fault on anyone's part, so being told "you have MRSA" does not tell you the infection was attributable to a failure in care. That link usually only becomes clear when a specialist reviews the hospital's infection-control records, screening logs, isolation decisions, hand-hygiene audits, and forms a view that a breach occurred and caused your infection.

This is sharper for infections than almost any other claim, because some patients carry organisms like MRSA on their skin before they are ever admitted. Telling a hospital-acquired infection apart from one carried in from the community is itself an expert exercise. Until a microbiologist can say your infection was acquired through a failure in care rather than carried in or simply unavoidable, you may not have the knowledge the Act requires.

There is an important limit on this, though. You cannot simply wait for an expert report if you already suspect negligence. The test includes knowledge you could reasonably acquire with appropriate advice, so once you have enough information to investigate, the clock can start even before a formal report lands. The practical message is the opposite of "wait and see": if you suspect your infection was preventable, the safest assumption is that time may already be running.

How is your date of knowledge actually decided?

The court decides it on the evidence, and the hospital will argue it started earlier than you say. Date of knowledge is rarely a single obvious moment, so it is usually the most contested issue in an infection time-limit dispute. The defendant's goal is to push your date back far enough to make the claim out of time.

This is why contemporaneous evidence matters so much. The dates that tend to decide the question include when you first complained to the hospital, when you requested your records, when you sought a second opinion, when you instructed a solicitor, and what you said to your GP or family at the time. GP notes, hospital letters, and even messages to relatives can all become evidence of when you first knew, or should have known, that a failing caused your infection.

The practical lesson is to document your own timeline early and honestly. A clear record of what you knew and when, supported by dated paperwork, is the strongest protection against an argument that your two years started sooner than you believed.

O'Sullivan v Ireland [2019] IESC 33: the key case for infection claims

O'Sullivan v Ireland is the key Irish authority on when the clock starts for a hospital infection. It is a Supreme Court decision built on the facts of an infection claim, which makes it directly relevant where general limitation cases are not. The judgment was delivered by Charleton J on 23 May 2019.^[3]

The patient, Oliver O'Sullivan, contracted MRSA during an operation at the Bon Secours Hospital in Cork in September 2005. He was told he had MRSA in October 2005, but it was not until a preliminary medical report on 22 February 2007 that the infection was linked to a possible outbreak at the hospital during his stay. He issued a plenary summons in August 2008. The hospital argued the claim was out of time, counting from 2005.

Knowing you had an infection was not the same as knowing it was caused by a wrongful act. The clock ran from the expert evidence, not the diagnosis.

The Supreme Court held the claim was in time. Knowing he had MRSA was not enough to fix him with knowledge that it was attributable to negligent infection control, because such an infection can occur even with proper care. Because he took reasonable steps to investigate, his date of knowledge was when the report connected his infection to a hospital failing, not the date he was diagnosed. The Supreme Court upheld the High Court and the majority of the Court of Appeal, where one judge had dissented on the limitation issue.

For anyone asking whether they are too late, O'Sullivan is the reason the answer is often "not necessarily." A clinical diagnosis of an infection does not automatically start the two-year countdown. The countdown turns on when the evidence reasonably established that the infection resulted from a failure to meet the required standard of care.

O'Sullivan does not mean you can wait indefinitely, though. In a more recent High Court decision, Monaghan v Molony [2024] IEHC 287, Bolger J found a claim out of time because the patient already had the facts needed to investigate long before his formal expert report.^[4] That case concerned a delayed orthopaedic referral rather than an infection, but the date-of-knowledge principle is the same, and the two cases mark the boundary the table sets out.

The practical line: if you genuinely could not connect your infection to a failing without an expert, your clock may start late. Once you suspect a failing, it is already running.

Three examples of how the clock runs for an infection

Worked examples make the rule concrete. The dates below are illustrative only. Your own date of knowledge depends on your specific facts, and the hospital will often argue it started earlier than you say.

The common thread is that the date of the infection is rarely the date that matters. What matters is when you knew, or should have known, that a failing caused it.

Is an infection caught in hospital automatically negligence?

No, an infection on its own is never proof of negligence. Now that the timing rule is clear, it helps to understand what actually needs to be shown, because that is what fixes your date of knowledge in the first place. Hospitals treat vulnerable, unwell people, and serious infections can occur even where hygiene and infection-control standards are met in full.

A claim exists only where the infection resulted from a failure to meet the required standard of infection prevention and control, and that failure can be shown to have caused the harm. In other words, you must prove both a breach of duty and causation, not merely that an infection happened. This is the same distinction that runs through every part of a hospital infection claim, and it is why proving causation is frequently the hardest element.

This also explains the timing. Because the law asks whether the injury was attributable to a breach, your knowledge is incomplete until someone qualified can say a breach likely occurred. Until then, you may know you were unwell without knowing you were wronged, and that gap is exactly what the date-of-knowledge rule is designed to recognise.

What evidence shows your infection was caused by negligence?

Expert analysis of the hospital's own records is usually what starts the clock. Because the breach is invisible to a patient, infection claims typically turn on documents and specialist opinion rather than anything you witnessed. Gathering that evidence is also what consumes much of the two-year window, which is why early advice matters.

The kinds of evidence that establish, or rule out, a negligent infection include hospital infection-control and screening records, isolation and bed-management decisions, hand-hygiene audit data, and your own medical records showing the timing of the infection. A consultant microbiologist often distinguishes an infection acquired through a hospital failing from one carried in from the community, or one that was an unavoidable risk of treatment.

The standard the hospital is measured against is published and named. For acute hospitals, the benchmark is the Health Information and Quality Authority (HIQA) National Standards for the prevention and control of healthcare-associated infections,^[9] supported by surveillance through the Health Protection Surveillance Centre (HPSC). An expert who finds that your care fell below those published standards is, in practice, identifying the breach, and the date you learn of that breach is often the date your clock starts.

HPSC surveillance can also help show whether an infection was acquired in the hospital rather than carried in. National EARS-Net data recorded an MRSA rate of about 10.7% of invasive S. aureus isolates in 2024, up from 9.6% in 2023, and the HPSC tracks strain types across hospitals, which can support the argument that an organism spread within a particular unit.^[8]

There is a procedural point that surprises many people. Medical negligence claims do not go through the Injuries Resolution Board. In an ordinary personal injury claim, applying to the IRB pauses the limitation clock. In a clinical negligence claim it does not, because these claims are excluded and proceed directly to court. Filing with the IRB therefore does nothing to protect an infection claim's deadline, only issuing proceedings stops the clock.

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What most guides miss about infection time limits

Three points are routinely left out, and each one can change whether you are in time. Most pages state the two-year rule and stop. The detail below is where infection claims are won or lost on timing.

Irish courts cannot extend the deadline. Unlike England and Wales, where a court has a discretion to disapply the limit, there is no general power in Ireland to extend the two-year period for a clinical negligence claim once it has expired. The date of knowledge is therefore the whole game. A claim that is one day late is, in the ordinary case, gone for good, which is why pinning down the start date early matters so much.

An open-disclosure meeting can start your clock. Since the Patient Safety (Notifiable Incidents and Open Disclosure) Act 2023 came into force, hospitals must hold a formal meeting after certain serious incidents.^[6] Being told at such a meeting that a failure caused your infection can fix your date of knowledge from that date. The apology offered at the meeting cannot be used against the hospital as proof of fault, but the information given can still start your two years running.

Issuing in time is not the finish line. Once proceedings are issued, a claim must be progressed without long, unexplained delay. In Kirwan v Connors [2025] IESC 21, decided in May 2025, the Supreme Court reformulated the long-standing Primor test and put the passage of time at its centre.^[5] In broad terms, after about two years of inactivity a claim may be dismissed where there is additional prejudice or another factor pointing that way, and once inactivity reaches around four years the onus shifts to the claimant to justify continuing, especially where the case depends on oral evidence. That risk bites hard in infection claims, which often hinge on ward staff recalling cleaning, screening, and isolation practices from years earlier. With the average Irish clinical negligence claim taking about four years to resolve, a case left idle after issue can still be struck out.

The deadline is the same in a private or public hospital. The two-year limit and the date-of-knowledge test apply identically whether your infection was acquired in a private hospital or an HSE public hospital. What changes is who you claim against. A claim arising from public hospital care is typically handled through the State Claims Agency, while a private hospital claim is brought against the hospital or clinicians directly. The route differs, but the clock does not.

Different timelines apply where the patient is a child, has died, or lacked capacity. These exceptions matter for infections, which can affect children and which can, through sepsis, become fatal. The detailed rules sit on our dedicated pages, linked below. What follows is how they apply here.

Am I too late? Practical steps if your hospital stay was years ago

Do not assume you are out of time because the infection was years ago. As O'Sullivan shows, the date that counts is usually when you could reasonably have linked the infection to a failure in care, which may be far more recent than the infection itself. Many people who believe their window has closed have not, in fact, run out of time.

Equally, do not assume time is on your side. If you already suspected the infection was preventable, the clock may have started then. The honest position is that only a review of your specific dates can tell you whether a claim is still live, and that review needs to happen quickly, because gathering records and expert evidence takes time you may not have to spare.

A practical first step is to write down the key dates while they are fresh: when you were admitted, when the infection was identified, when you were told about it, and when you first suspected it might have been avoidable. Those dates, supported by GP letters, hospital correspondence, and your own notes, are what a solicitor uses to work out when your clock started.

Common questions about hospital infection time limits

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