Surgeons in Australia opened a woman’s skull and pulled out a living, wriggling worm — the first time this parasite had ever been found in a human brain anywhere on Earth.
Story Snapshot
- An 8 cm live roundworm was removed from an Australian woman’s right frontal lobe in 2022 and confirmed as a species never before found in any human.
- Doctors spent over a year treating her for a suspected autoimmune disease before brain surgery revealed the true culprit.
- Researchers believe she picked up the parasite by handling wild greens near a lake where carpet pythons lived.
- She recovered after surgery and a course of antiparasitic drugs, but the case exposed a gap in public health warnings about foraging near wildlife.
A Worm No Doctor Had Ever Seen in a Human
In June 2022, surgeons at Canberra Hospital in Australia made a discovery that stopped the operating room cold. Inside a lesion in the patient’s right frontal lobe, they found a pale, wriggling worm about 8 centimeters long. It was alive. Genetic testing confirmed it as Ophidascaris robertsi, a roundworm that normally lives in carpet pythons. Associate Professor Sanjaya Senanayake of the Australian National University called it the “first-ever human case of Ophidascaris to be described in the world.” No textbook had prepared anyone for this.
The Commonwealth Scientific and Industrial Research Organisation (CSIRO) confirmed the finding. This species had never before jumped from its reptile host to a human, let alone reached a human brain. The worm belongs to a class of parasites that use intermediate hosts — small mammals like rats — to complete their life cycle. The woman was never bitten by a snake and had no direct contact with one. The path to her brain was far more ordinary, and far more unsettling, than a snake encounter.
Twelve Months of Wrong Answers Before the Right One
The patient’s ordeal began well before surgery. For roughly a year, doctors treated her for a condition called hypereosinophilic syndrome, a disorder where the immune system floods the body with a type of white blood cell. She had lesions in her lungs, liver, and spleen. Those lesions were almost certainly the worm’s larvae migrating through her body, but no one knew it yet. Doctors gave her steroids to suppress her immune system — the exact opposite of what a parasitic infection requires — because they did not yet know a parasite was the cause.
That 12-month gap between first symptoms and correct diagnosis is the most troubling part of this story. Immunosuppression likely allowed the larvae to travel further and more freely. The brain lesion that finally triggered surgery had grown to 13 millimeters. By the time surgeons went in, the worm had been living inside her for well over a year. The misdiagnosis was understandable — this infection had never been seen before — but it is a reminder of how badly rare diseases can fool even skilled clinicians.
Wild Greens, a Lakeside Walk, and an Invisible Risk
Researchers believe the woman infected herself while doing something completely routine: picking warrigal greens, a native leafy plant, near a lake in southeastern Australia. Carpet pythons are common in that region. The working theory is that a python defecated near the plants, leaving behind Ophidascaris robertsi eggs. The woman likely touched the greens, then touched her mouth, or ate them without washing them thoroughly enough. No one tested the actual plants she collected, so this remains a hypothesis rather than a proven fact.
That uncertainty matters, but it does not change the practical lesson. Carpet python territory covers a wide swath of Australia. Warrigal greens grow throughout that same range. Australian health authorities have not issued a specific public advisory about foraging near python habitats. That silence is hard to justify after a case this dramatic. People who forage wild plants near waterways — a growing hobby across the country — deserve clear guidance. Wash everything. Cook what you can. Know what animals share your foraging ground.
Recovery Was Real, but the Media Got the Story Wrong
After surgery, the patient received albendazole and ivermectin, two antiparasitic drugs, along with steroids to manage inflammation. Within six months, her blood work normalized and her cognitive and mood symptoms improved. That is genuinely good news. But some media coverage badly distorted what actually happened. Headlines screamed about “38 brain parasites” and “tapeworms,” neither of which matches the peer-reviewed case report. There was one worm, one species, one patient — and it was a roundworm, not a tapeworm. Sensational framing like that does real harm. It triggers fear without teaching anything useful, and it makes it harder for people to assess actual risk calmly and clearly.
What This Case Means Beyond One Patient
Australia has a well-documented history of novel zoonotic diseases — illnesses that jump from animals to humans. Australian bat lyssavirus killed two people in the 1990s. Hendra virus has killed four of the seven people it infected. Those were viral threats. This case is the first confirmed instance of a helminth, a parasitic worm, from a reptilian host reaching a human brain. It is a genuinely new category of risk. The science is solid. The case report is peer-reviewed and published by the Centers for Disease Control and Prevention. No credible voice disputes the core facts. The only real question is whether public health agencies will act on what this case revealed before the next one occurs.
Sources:
mirror.co.uk, eurekalert.org, pubmed.ncbi.nlm.nih.gov, unmc.edu, instagram.com
