Did the colonoscope used on you carry an infection risk nobody told you about?

That gap — between a procedure described as routine and a body that tells a different story — is where many people first start asking questions. The questions come slowly at first. Then they become harder to ignore.

Some people carry them for months before looking for answers. Others are still in the middle of treatment when they find this article. Both are in the right place.

This article is written for people who had a colonoscopy, developed an unexpected infection or illness afterwards, and are trying to understand whether those two things are connected — and whether anyone is responsible. By the end, you will understand what hospitals and manufacturers were required to do, where the system failed, and what the law says about the harm that followed.

What you were entitled to — and may not have received

A colonoscopy is a procedure in which a long, flexible tube — the colonoscope — is passed through the bowel to examine the lining of the large intestine. It is one of the most commonly performed diagnostic procedures in Australia. Most people who have one are told it carries a small risk of perforation or bleeding. Very few are told anything about the scope itself.

That omission matters. Colonoscopes — and in particular certain models manufactured by Olympus — have been the subject of documented contamination concerns in Australia and internationally. The design of these instruments includes narrow internal channels that are difficult to clean thoroughly. When reprocessing — the cleaning and disinfection process between patients — fails to eliminate residual biological material, the scope can transmit bacteria, including drug-resistant organisms, from one patient to the next.

Australian law requires that hospitals and clinicians tell patients about any risk that a reasonable person in their position would want to know about before consenting to a procedure.¹ A known contamination risk associated with a specific device is precisely that kind of risk. The failure to disclose it is not a technicality — it is a breach of the patient’s right to make an informed decision.

Where it goes wrong — the specific failure patterns

The design problem the manufacturer knew about

Olympus colonoscopes — particularly models featuring an elevator mechanism at the distal tip — have been the subject of documented safety concerns in Australia and internationally. The elevator channel creates a small, difficult-to-access space inside the instrument. Standard reprocessing, even when performed correctly, cannot reliably eliminate all biological material from this channel.

The Therapeutic Goods Administration (TGA) has issued safety alerts and received field safety notices from Olympus relating to reprocessing limitations in specific colonoscope models.² These notices placed an obligation on hospitals to review their practices and, in some cases, to notify patients who had undergone procedures with affected devices.

The legal significance is this: a manufacturer who places a device on the market knowing that standard reprocessing cannot make it safe for reuse carries responsibility for the harm that results. A hospital that continues using a device after receiving a safety notice — without adjusting its practice or informing patients — compounds that responsibility.

Reprocessing failures at the hospital level

Even where the device design is not itself defective, hospitals carry an independent obligation to ensure their reprocessing systems are adequate. This means using validated equipment, following current manufacturer instructions, training staff appropriately, and auditing compliance. When any link in that chain breaks, the risk transfers to the next patient.

Australian health facilities are required to maintain documented reprocessing records for each endoscope, including the identity of the scope used for each patient. This traceability requirement exists precisely so that, if a reprocessing failure is identified, the facility can locate and notify every patient who may have been exposed. When those records are incomplete or absent, the failure to notify patients is itself a separate breach of the standard of care.

The failure to tell patients what they needed to know

Consent to a colonoscopy typically covers the risks of the procedure itself — perforation, bleeding, adverse reaction to sedation. It does not typically cover the risk that the instrument used might carry contamination from a previous patient, or that the device has been the subject of a manufacturer safety notice.

Australian law is clear that consent is only valid when the patient has been told about material risks — risks that a reasonable person in their position would want to know about before agreeing to the procedure.¹ A documented contamination risk associated with a specific device model is a material risk. The failure to disclose it means the patient’s consent was not fully informed. That matters legally — not because it voids the procedure, but because it removes the hospital’s ability to say the patient accepted the risk.

For further information on national standards for endoscope reprocessing, the Australian Commission on Safety and Quality in Health Care publishes guidance that applies to all Australian health service organisations.

What your own situation might mean

If you developed a fever, abdominal infection, bloodstream infection, or an unusual illness in the weeks following a colonoscopy, and nobody at the treating facility raised the possibility that the scope was the source — that silence is itself significant. The facility had an obligation to investigate and, if a reprocessing failure was identified, to tell you.

If you were never told — before your procedure — that the model of colonoscope being used had been the subject of a manufacturer safety notice or TGA alert, your consent to the procedure was based on incomplete information. The law does not require that you would have refused the procedure. It requires only that you had the right to make that decision with full information.

If the hospital conducted a look-back program and notified other patients but did not notify you — or notified you months after the failure was identified — the delay in notification is a separate failure. Delayed notification means delayed treatment, delayed diagnosis, and harm that could have been reduced.

If the infection you developed was caused by a drug-resistant organism — one that is difficult to treat and carries a higher risk of serious complications — the severity of the harm is directly connected to the nature of the contamination risk that was not disclosed to you.

The legal picture — briefly

Three parties carry potential legal responsibility in Olympus colonoscope contamination cases: the manufacturer, the hospital or day surgery facility, and — in some circumstances — the clinician who performed the procedure.

The manufacturer owes a duty to ensure that devices placed on the market are safe for their intended use, and to warn hospitals and patients when a known design limitation creates a contamination risk that standard reprocessing cannot eliminate.³ The hospital owes a duty to implement adequate reprocessing systems, maintain traceability records, and disclose material risks before obtaining consent. The clinician owes a duty to ensure that the patient’s consent is genuinely informed — including disclosure of device-specific risks where those risks are known.

The distinction that matters here is between a complication that was always possible — even with perfect care — and harm that resulted from a failure that the responsible party knew about and did not address. A post-procedural infection caused by a contaminated scope is not a known complication of colonoscopy. It is the consequence of a system failure. That distinction is the foundation of a legal claim.

For a broader overview of how these claims are assessed, see Reframe Legal — Medical Negligence.

The harm that follows

The physical consequences of a colonoscope-transmitted infection range from a self-limiting gastrointestinal illness to life-threatening sepsis. Drug-resistant organisms — including carbapenem-resistant Enterobacteriaceae (CRE), which have been identified in endoscope-related outbreaks internationally — require prolonged intravenous antibiotic treatment, carry a high mortality risk, and can cause permanent organ damage.

Even infections caused by less resistant organisms can have lasting consequences. Repeated courses of antibiotics disrupt the gut microbiome in ways that take months or years to resolve. Some patients develop chronic bowel symptoms — pain, altered motility, persistent inflammation — that persist long after the acute infection has cleared.

Psychologically, the experience of developing a serious infection after a routine procedure — and then being told, or discovering independently, that the instrument used on you was known to carry a contamination risk — produces a specific kind of harm. Trust in the medical system fractures. Anxiety about future procedures becomes a barrier to necessary care. The sense of having been used as a patient without being treated as a person who deserved honest information is not a minor grievance. It is a recognised form of psychological injury.

What compensation covers

Australian law allows compensation for the full range of harm caused by a negligent care failure — not just the immediate medical costs. That includes the cost of treatment you have already received, the cost of treatment you will need in the future, income you lost while you were unwell or recovering, and the pain, suffering, and loss of enjoyment of life that resulted from the infection and its consequences.

Compensation for pain and suffering in Australia requires that the harm crosses a threshold of significance — the precise threshold varies between states and territories, and the applicable rules depend on where your procedure was performed and where you live.⁴ The financial losses — treatment costs, lost income, care costs — are calculated separately and are not subject to the same threshold.

Time limits apply. In most Australian states and territories, a claim must be commenced within three years of the date you knew — or ought reasonably to have known — that you had suffered harm as a result of a care failure. For colonoscope contamination cases, that clock often starts not when the infection occurred, but when you first had reason to connect the infection to the scope. If you were not notified by the facility, the discovery rule may extend your time to act.⁵

General reference ranges only. Every case turns on its own evidence — medical records, expert clinical opinion, and financial reports that quantify actual loss.

For a detailed explanation of how these claims proceed in practice, see Reframe Legal — How Medical Negligence Claims Work in NSW.

Was what happened to you avoidable?

The question you have been carrying — whether anyone should have told you, whether the scope should have been safer, whether the infection was preventable — is not an overreaction. It is the right question.

The records will tell a clearer story than memory alone. The scope’s reprocessing log, the model and serial number of the instrument used, the facility’s maintenance records, and the TGA’s published alert history for that device — these documents exist, and they are recoverable. What the records show is more reliable than what anyone remembers saying in a consent conversation that lasted four minutes.

Many people wait a long time before looking into this. The waiting is understandable — the procedure was supposed to help, the infection was frightening, and the idea of questioning the people who treated you feels uncomfortable. None of that means the question is wrong. It means you are human. The question deserves an honest answer, whatever that answer turns out to be.

If the failure to disclose the contamination risk before your procedure is part of what concerns you, the legal framework around informed consent is explained in detail at Reframe Legal — Informed Consent and Medical Negligence.

If you want to understand the regulatory framework that governs the clinicians involved, AHPRA — Australian Health Practitioner Regulation Agency maintains the national register of registered health practitioners and handles complaints about professional conduct.

About the author

Dr Rosemary Listing holds a PhD in medical negligence and practises as a lawyer with a dual background in medicine and law. Her practice focuses on cases where clinical and legal analysis intersect — cases where understanding what went wrong requires fluency in both disciplines.

Colonoscope contamination cases sit at a particularly complex intersection. The failure is not always visible in the clinical notes. The connection between the procedure and the infection is often disputed. Establishing liability requires examining the device’s regulatory history, the facility’s reprocessing records, the manufacturer’s safety communications, and the consent process — simultaneously. That kind of analysis requires someone who understands what the records mean, not just what they say.

The people who seek a legal examination of their records in these cases are rarely looking to blame anyone. They are looking for an honest account of what happened to them — and whether the harm they are still living with was preventable. Many waited months or years before asking. The waiting is understandable. The question, when they finally ask it, is almost always the right one.

Dr Listing examines the available records alongside expert clinical opinion to give an honest answer — including when that answer is that the harm, while real and serious, does not meet the legal threshold for a claim. Her role is to give people the information they need to understand their situation clearly, not to tell them what they want to hear.

This article contains general legal information only. It does not constitute legal advice, and reading it does not create a lawyer–client relationship. The law discussed applies to Australia. Laws and time limits vary between states and territories, and these differences may affect your position. You should seek independent legal advice about your specific situation.