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CBC
27-05-2025
- Health
- CBC
N.B. completes data analysis phase of mystery brain illness investigation
Social Sharing New Brunswick has completed the data analysis phase of its investigation into an undiagnosed neurological illness affecting hundreds of people and has submitted its results to the Public Health Agency of Canada for scientific review. No information about New Brunswick's findings into the mystery brain illness, first flagged by Moncton neurologist Dr. Alier Marrero several years ago, have been released. But the main purpose of this latest investigation announced in March is to "further understand concerns" Marrero raised regarding elevated levels of certain environmental substances, such as heavy metals and the herbicide glyphosate, in some patients. "While we know New Brunswickers are eager [to] see the results of the analysis, we will wait until the scientific review is completed before sharing findings as part of the final report," expected this summer, along with recommendations, Dr. Yves Léger, the chief medical officer of health, said in a statement Tuesday. "Having the findings reviewed, both internally and by the Public Health Agency of Canada, will ensure we come out of this process with a robust understanding of what the data is telling us," Léger said. WATCH | 'There's optics of being a part of the process': Mystery brain illness patients seek clarification on investigation 4 hours ago Duration 1:08 New Brunswick has completed the data analysis phase of its investigation into an undiagnosed neurological illness and submitted the results to the Public Health Agency of Canada for scientific review, but patients still feel in the dark about the process, says advocate Stacie Quigley Cormier. "This will help us determine what needs to happen next to support affected patients and their families." The data analysis included 222 patients for whom Marrero had completed the enhanced surveillance forms Public Health created to report the mysterious brain cases, with symptoms ranging from painful muscle spasms and hallucinations to memory loss and behavioural changes. According to a letter Marrero wrote to federal and provincial officials in February, the number of people suffering from unexplained neurological symptoms has jumped to more than 500 across New Brunswick, Nova Scotia, P.E.I., Newfoundland, Ontario, Quebec and Alberta. Fifty people have died. Patients hoped for interim report Patient advocate Stacie Quigley Cormier, whose stepdaughter Gabrielle is one of Marrero's patients, said they're happy to see the New Brunswick investigation moving forward. But patients still feel in the dark about the process, she said. So she has requested clarification about what exactly the federal agency's role entails. "We know that Public Health Agency of Canada is … reviewing files, but we don't know what exactly that looks like. So that's where we stand right now. We're looking for some more transparency," said Quigley Cormier. "When patient data is getting reviewed, who is reviewing it, what's the mandate during the review — that kind of thing." Patients are also disappointed New Brunswick's preliminary findings have not been released, Quigley Cormier said. They had hoped to see an interim report. "It would have given us a gauge and maybe some more communication around … the inner workings and things that are going on behind the scenes more in-depth, and that would give patients a lot of confidence." The Public Health Agency of Canada could not immediately be reached for comment. It's unclear how long its review will take. No mystery disease, study found A scientific study published earlier this month in the Journal of the American Medical Association, known as JAMA, found no evidence of a mystery brain disease in New Brunswick. Researchers reassessed 25 of 222 patients diagnosed by Marrero as having a "neurological syndrome of unknown cause" and concluded all of the cases were attributable to well-known conditions, such Alzheimer's and Parkinson's, functional neurological disorder, traumatic brain injury and metastatic cancer. An investigation under the former Higgs government reached a similar conclusion in February 2022. An oversight committee consisting of six neurologists found that the patients did not have a common illness and offered "potential alternative diagnoses" for 41 of the 48 patients. Premier Susan Holt has said it's critical the province push ahead with its current investigation because "there's too many unanswered questions" about what's making New Brunswickers sick. Last summer, Holt pledged to launch a transparent scientific investigation if elected in the October provincial election. New Brunswickers suffering from unexplained symptoms and the doctors trying to help them had "been ignored" for too long and deserved answers, she said in a statement at the time. It was early 2021 when the public learned that Public Health was monitoring more than 40 New Brunswick patients, primarily on the Acadian Peninsula and in the Moncton region, with symptoms similar to those of Creutzfeldt-Jakob disease, a rare and fatal brain disease. The first case dated back to 2015, according to an internal memo. New information line, mental health support The province has also launched an information line to support New Brunswickers during this investigation, Health Minister Dr. John Dornan announced Tuesday. People can call 1-866-506-9355 between 8 a.m. and 8 p.m. to get information about the investigation and its status, he said. The same information is also available through a website launched in March.
Daily Mail
09-05-2025
- Health
- Daily Mail
Mysterious explosion of brain diseases in rural city takes shocking twist
Public health officials investigating a mysterious brain disease in Canada have finally released the findings of a long-awaited study — and not everyone is convinced. Since 2019, a small town in New Brunswick — a Canadian province bordering Maine — has experienced hundreds of cases of people suffering from hallucinations, spasms, rapid memory loss and the sensation of bugs crawling under the skin. More than 500 people in the area, mostly in the city of Moncton, were reported to have the disease by local neurologist Dr Alier Marrero, who was the first to raise the alarm. However, as no definitive diagnosis has ever been made, the area was reported to be suffering from a 'mystery' brain disease. But now, after examining two dozen of those cases, researchers say the odds that a new illness has emerged are less than one in a million — and they believe the patients were instead suffering from known conditions like Alzheimer's. Patients and their families are raising concerns over the study, however, after it was revealed scientists on the study had previously received fundingfroma company suspected by some locals to be involved in the outbreak. Online records reveal scientists on the study worked at a hospital that had received $2million from Irving Oil, which extracts hydrocarbons in the state — with some locals suggesting pollution from these could have been behind the cases. The scientists who led the study strongly refuted claims that this had any influence over their research, adding that the funding was for a completely separate project. The 'mystery illness' theory gained traction in 2021 when Canadian health authorities began investigating cases based on Dr Marrero's reports. Patients were recorded in Moncton, home to 79,000 people, and in a sparsely populated area in its north called the Acadian Peninsula. While more than 500 were reported, researchers found 222 patients. Known as New Brunswick neurological syndrome of unknown cause, people became concerned in the area that it was being caused by something in the water. Doctors initially suggested patients had Cruetzfeldt-Jakob Disease, or Prion disease, an extremely rare group of neurologic conditions caused by misfolded proteins in the brain. But tests for this came back negative. After a two-year investigation of 25 of the patients, scientists from the University of Toronto and the Horizon Health Network concluded there was 'no support for an undiagnosed mystery disease in New Brunswick' and their research 'revealed well-defined diagnoses.' Published in the US-based journal JAMA, researchers involved in the study contacted 105 patients in the cluster for evaluation. Of these, 52 declined further contact while 42 did not respond. In total, 15 patients were evaluated. Scientists also obtained permission to perform autopsies on the bodies of 11 additional patients in the cluster who had died. Their causes of death were not revealed. Evaluations were carried out between November 2023 and March 2025. Based on autopsies, among patients who had died, seven had a form of dementia. One had adenocarcinoma — a malignant tumor — one had progressive supranuclear palsy — a rare disease that affects walking, balance and swallowing — and one had vascular dementia. Another patient had unremarkable autopsy findings, but had previously been diagnosed with a primary psychiatric disorder. The doctors said all these diseases could have caused the symptoms that were considered to be part of the mystery cluster. Researchers noted there was an absence of one specific change in the brain across all groups that may suggest common exposure to one factor. Among the 14 patients that came forward for neurological tests, 10 agreed to a second evaluation by four movement disorder neurologists and two behavioral neurologists. Previously, the patients had only been assessed by Dr Marrero. He had found all 10 patients had myoclonus — a disorder causing sudden and involuntary muscle jerks — while seven had ataxia — a neurological condition caused by a lack of muscle coordination. But in the new study, only one of the reassessed patients was found to have a cognitive disorder while two were found to have a psychiatric disorder. Five others were found to have no cognitive deficits, while two were found to be normal. None were found to have myoclonus or ataxia as Dr Marrero had suggested. The researchers said they found 'meaningful discrepancies' between the documented initial history of the patients' conditions and their findings on the second assessment. This included three patients reported to have experienced hallucinations, whose symptoms were not confirmed on second evaluation. And 10 patients initially reported to have a neurological disorder, with this not found on follow-up. In their conclusion, the researchers said their investigation highlighted the importance of getting a second evaluation for a neurological diagnosis. They also said their findings highlighted the erosion of public trust in institutions, which has been blamed on Covid vaccine mandates in the pandemic. Marrero responded to the study, however, telling NBC News: 'I am in profound disagreement with the study conclusions and have many questions regarding the methods and the content. 'I am sure that our patients, families, and communities share the same very serious concerns.' Additionally, the study lists several potential notes under the 'conflicts of interest' heading, including that some of the authors had previously worked for Canadian health authorities and a number of pharmaceutical companies - with some saying it calls into question the researchers' objectivity. The New Brunswick government's investigation into the outbreak is ongoing, with the state's chief medical officer saying this week that it would continue. Dr Yves Léger said the new study 'doesn't change my office's intention to complete its own investigation into cases of undiagnosed neurological illness in New Brunswick.'
