Every year, millions of Americans undergo endoscopic procedures trusting that the devices used are safe and sterile. But reusable endoscopes — particularly those manufactured by Olympus — carry a hidden danger: contamination. Design defects make these devices nearly impossible to fully clean, putting patients at risk of life-threatening infections.
This page explains how endoscope contamination occurs, why Olympus scopes are at the center of a nationwide health crisis, and what you can do if you or a loved one was harmed.
Free Case ReviewEndoscopes are long, flexible medical devices equipped with a tiny camera and light source at their tip. Physicians insert them through natural body openings — the mouth, throat, or rectum — to visually examine the interior of organs and body cavities. These devices are essential diagnostic and therapeutic tools used in some of the most common medical procedures performed in the United States.
The procedures that rely on endoscopes include colonoscopies, which examine the colon and rectum; ERCP (endoscopic retrograde cholangiopancreatography), which diagnoses and treats bile duct and pancreatic conditions; bronchoscopies, which examine the airways and lungs; gastroscopies (also called upper endoscopies or EGDs), which inspect the esophagus, stomach, and upper small intestine; and enteroscopies, which evaluate the small intestine.
Unlike many medical devices that are used once and discarded, endoscopes are designed to be reusable. A single endoscope may be used on hundreds of patients over its lifespan. This means the device must be thoroughly cleaned and disinfected — a process called "reprocessing" — between every single patient. The assumption is that reprocessing renders the scope safe for the next patient. But as the evidence now shows, that assumption is dangerously flawed, particularly when it comes to endoscopes manufactured by Olympus Corporation.
Hospitals and outpatient surgical centers across the country perform tens of millions of endoscopic procedures annually. Colonoscopies alone account for approximately 20 million procedures per year, while ERCPs add another 700,000. The sheer volume of procedures — combined with the inherent difficulty of cleaning these complex devices — means that even a small failure rate translates into thousands of patients exposed to contaminated scopes every year.
Endoscope contamination occurs when dangerous pathogens — bacteria, viruses, and other microorganisms — survive the cleaning and disinfection process and remain inside the device. When that contaminated scope is then used on the next patient, those pathogens are introduced directly into the patient's body, often deep into vulnerable internal organs where the immune system has limited ability to fight them off.
The interior of an endoscope is far more complex than most patients realize. These devices contain multiple narrow internal channels — some less than two millimeters in diameter — through which air, water, and surgical instruments pass during procedures. During use, these channels become coated with blood, tissue fragments, bile, mucus, and other biological material from the patient. Every crevice, joint, and seal within the scope represents a potential harbor for bacteria.
Reprocessing a reusable endoscope is a multi-step procedure that hospital staff must execute with precision. The standard protocol includes:
If any single step in this process is insufficient — if a brush does not reach every surface, if disinfectant contact time is cut short, if channels are not fully dried — pathogens survive. And in the case of Olympus duodenoscopes, studies have demonstrated that even when hospitals follow the manufacturer's reprocessing instructions to the letter, dangerous bacteria persist inside the device. The problem is not human error. The problem is the design of the scope itself.
Olympus Corporation is the world's largest manufacturer of endoscopes. Internal documents, FDA investigations, and independent research have revealed critical design defects that make their scopes inherently unsafe.
The tip of Olympus duodenoscopes features a small mechanical component called the "elevator" that guides surgical instruments during ERCP procedures. This elevator is housed within a sealed cavity that traps blood, tissue, and bacteria. Cleaning brushes and disinfectant solutions cannot adequately reach inside this sealed space, creating a persistent reservoir of contamination.
Olympus scopes contain multiple narrow, winding internal channels with tight turns, crevices, and dead-end spaces. These channels are designed for instrument passage and suction during procedures, but their complexity makes thorough manual brushing practically impossible. Biofilm — a sticky matrix of bacteria that adheres to surfaces — builds up in these channels over repeated uses and resists standard disinfection.
Evidence shows that Olympus was aware of the contamination risk for years before taking meaningful action. Internal communications reveal that the company knew its reprocessing instructions were insufficient to eliminate pathogens. Despite this knowledge, Olympus continued marketing and selling these devices without adequately warning hospitals or patients about the risk of cross-contamination.
Federal law requires medical device manufacturers to report adverse events — injuries, infections, and deaths associated with their products — to the FDA. Investigations revealed that Olympus failed to file required adverse event reports for years, preventing regulators from identifying the scope of the contamination problem and taking earlier action to protect patients.
The FDA has issued multiple Class I recalls — the most serious category, reserved for situations where there is a reasonable probability of serious adverse health consequences or death — for Olympus endoscopes. In 2025, the FDA issued an import alert covering 58 Olympus endoscope models, effectively blocking these devices from entering the United States due to safety concerns.
Contamination outbreaks linked to Olympus endoscopes have occurred at hospitals across the United States and around the world. From UCLA Ronald Reagan Medical Center to Virginia Mason Medical Center in Seattle, from Cedars-Sinai in Los Angeles to hospitals in Europe and Asia, the pattern is consistent: facilities that followed Olympus's own cleaning protocols still experienced deadly superbug outbreaks.
Contaminated endoscopes have been directly linked to the transmission of some of the most dangerous pathogens known to medicine. Because these devices are inserted deep into the body — into the gastrointestinal tract, bile ducts, and airways — any bacteria present on the scope has direct access to vulnerable tissue. The following infections have been documented in connection with contaminated Olympus scopes:
Often called "superbugs" or "nightmare bacteria" by the CDC, CRE infections are resistant to nearly all available antibiotics. These bacteria carry a mortality rate of up to 50% in bloodstream infections. CRE outbreaks at major hospitals have been directly traced to contaminated Olympus duodenoscopes, even at facilities with rigorous infection control programs.
Certain strains of E. coli can cause severe gastrointestinal infections, urinary tract infections, and bloodstream infections (bacteremia). When introduced into the bile duct or pancreas via a contaminated duodenoscope, E. coli can cause life-threatening cholangitis and sepsis requiring emergency hospitalization and aggressive IV antibiotic therapy.
Pseudomonas is an opportunistic pathogen that thrives in moist environments — exactly the conditions found inside improperly dried endoscope channels. It is naturally resistant to many antibiotics and can cause severe pneumonia, bloodstream infections, and wound infections. Patients with weakened immune systems are particularly vulnerable to Pseudomonas transmitted through contaminated scopes.
Klebsiella is another member of the Enterobacteriaceae family frequently found in contaminated endoscopes. Drug-resistant strains of Klebsiella have been increasingly documented in healthcare settings and are particularly dangerous for patients who are elderly, immunocompromised, or already hospitalized for other conditions. Klebsiella infections can lead to pneumonia, bloodstream infections, and meningitis.
While less common than bacterial transmission, there have been documented cases of bloodborne viral pathogens — including HIV, Hepatitis B, and Hepatitis C — being transmitted through contaminated endoscopic equipment. These viruses can survive on improperly cleaned surfaces and in residual blood trapped within scope channels, creating a risk of transmission to subsequent patients.
These infections can lead to sepsis (a systemic, life-threatening response to infection), organ failure (particularly kidney and liver failure), prolonged hospitalization requiring weeks or months of IV antibiotics, additional surgeries, and in the most tragic cases, death. If you experienced any of these outcomes after an endoscopic procedure, learn more about the symptoms to watch for.
According to research published in the National Institutes of Health (NIH), contaminated medical devices contribute to tens of thousands of healthcare-associated infections and deaths in the United States each year. Endoscopes — because of their complex internal design, their contact with mucous membranes and internal organs, and the sheer number of procedures performed annually — represent one of the highest-risk categories of reusable medical devices.
What makes the Olympus situation particularly troubling is the evidence that the company knew about these risks and failed to take adequate action. While patients trusted that their endoscopic procedures were safe, Olympus was aware that its devices harbored design defects that could — and did — transmit deadly infections from one patient to the next.
The Alvarez Law Firm represents patients nationwide who were harmed by contaminated Olympus endoscopes. Our team — led by Board Certified trial lawyers and Herb Borroto, M.D., J.D. — combines medical and legal expertise to build the strongest possible case on your behalf. Your consultation is free, confidential, and comes with zero obligation.
