Helminthic therapy and multiple sclerosis (MS)
Research findings[edit | edit source]
- 2025 Apr 22 Modulation of the Inflammatory Signature in an Experimental Autoimmune Encephalomyelitis Model through Treatment with Fasciola hepatica-Derived Recombinant Fatty Acid Binding Protein (rFh15) -- Full text
- 2025 Feb 28 An immunoregulatory amphipathic peptide derived from Fasciola hepatica helminth defense molecule (FhHDM-1.C2) exhibits potent biotherapeutic activity in a murine model of multiple sclerosis -- Full text | PDF
- 2024 Oct 30 Helminth infection and Multiple Sclerosis
- 2024 Jan 15 Modulatory Effects of Hydatid Cyst Fluid on a Mouse Model of Experimental Autoimmune Encephalomyelitis -- Full text | PDF
- 2024 Effect of infections on multiple sclerosis (chapter of Mechanisms of Disease Pathogenesis in Multiple Sclerosis)
- 2022 Jun 13 Multiple sclerosis and the microbiota: Progress in understanding the contribution of the gut microbiome to disease -- Full text | PDF. A narrative review of the literature on MS and the microbiota included consideration of how the re-introduction of complex eukaryotic symbionts, especially helminths and protists, halts the progression of RRMS by direct modulation of the host immune system, providing conclusive evidence to support the idea that the loss of eukaryotic symbionts is the pivotal evolutionary mismatch that underlies the pathogenesis and progression of MS.
- 2021 Nov Interleukin-35 is a critical regulator of immunity during helminth infections associated with multiple sclerosis -- Full text
- 2021 Apr 14 Experimental infection with the hookworm, Necator americanus, is associated with stable gut microbial diversity in human volunteers with relapsing multiple sclerosis -- Full text | PDF
- 2021 Jul The fatty acid-binding protein (FABP) decreases the clinical signs and modulates immune responses in a mouse model of experimental autoimmune encephalomyelitis (EAE) -- Full text
- 2021 Jan 29 The Worm-Specific Immune Response in Multiple Sclerosis Patients Receiving Controlled Trichuris suis Ova Immunotherapy -- Full text
- 2020 Dec Dicrocoelium ova can block the induction phase of experimental autoimmune encephalomyelitis -- Full text (preprint version Mars 16) "Dicrocoelium eggs have a great potential to stimulate immunomodulation towards treatment of EAE during the initial phase."
- 2020 Sept 29 The Helminth Parasite Heligmosomoides polygyrus Attenuates EAE in an IL-4Rα-Dependent Manner -- Full text | PDF
- 2020 Aug 28 An Absence of Epstein-Barr Virus Reactivation and Associations with Disease Activity in People with Multiple Sclerosis Undergoing Therapeutic Hookworm Vaccination -- Full text
- 2020 Jun 18 Hookworm trial offers new hope to MS patients. In 2020, researchers at Nottingham University reported the results of a randomized double-blinded placebo-controlled trial in which patients with RRMS were experimentally colonised by NA, and in which half of the treated patients did not develop any new lesions during the nine-month trial period. The conclusion published in their formal report by the authors of this study that NA appeared to be ineffective against MS was based on the fact that the particular statistical endpoint determined for the trial by its designers had not been reached. [1] This conclusion is a glaring example of the endemic failure within the mainstream medical research community to understand, and accommodate, the unique requirements of living organisms when they are being trialled as a therapy. To read more about this, see, Problems with clinical trials using live helminths.
- ✅ 2020 Jun 15 Hookworm Treatment for Relapsing Multiple Sclerosis: A Randomized Double-Blinded Placebo-Controlled Trial -- Full text. Editorial from Jama Neurology : Keep the Worms in the Mud. (While the primary statistical endpoint of this trial - the cumulative number of new/enlarging T2 and new enhancing T1 lesions at month 9 - was not significantly different between the hookworm group (154) and the placebo group (164), a closer examination of the data reveals that more than half the patients given hookworms did not have any new lesions. “The findings of the research… show that infecting MS patients with a safe dose of… Necator americanus induces immunoregulatory responses and boosts the number of cells which help keep the immune system under control.” [2] The trial’s lead researcher concluded, “I think there would be a niche for this approach - for individuals with mild disease who don't want to take immunomodulating drugs for life and would prefer a more natural approach.” [3])
- 2020 Jan-Feb Perspectives of People with Multiple Sclerosis About Helminth Immunotherapy -- Full text
- 2019 Jul-Dec The endosymbiotic role of intestinal helminths in multiple sclerosis: Promising probiotic hypothesis -- Full text
- 2019 Apr 23 Helminths products directly modulate T cells that mediate experimental autoimmune encephalomyelitis
- 2018 Oct 17 Failure of the Anti-Inflammatory Parasitic Worm Product ES-62 to Provide Protection in Mouse Models of Type I Diabetes, Multiple Sclerosis, and Inflammatory Bowel Disease -- Full text
- 2017 Oct 3 The Effects of Intestinal Nematode L4 Stage on Mouse Experimental Autoimmune Encephalomyelitis
- 2017 Oct 1 Safety and efficacy of helminth treatment in relapsing-remitting multiple sclerosis: Results of the HINT 2 clinical trial -- PDF This trial employed a novel TSO formulation with a pH of 5, when it is known that storage of TSO at a pH above 4 may impede its therapeutic effect in humans. [4] The conclusions drawn by the authors of this study about the efficacy of TSO are therefore not reliable.
- 2017 Sep Human herpes virus antibody levels in helminth treated and placebo controlled multiple sclerosis patients | [5] (thesis)
- 2017 Jun 28 Helminth Products Potently Modulate Experimental Autoimmune Encephalomyelitis by Downregulating Neuroinflammation and Promoting a Suppressive Microenvironment -- Full text | PDF)
- 2017 Jun 13 Environmental factors influencing multiple sclerosis in Latin America -- Full text | PDF
- 2017 Mar Trichuris suis secrete products that reduce disease severity in a multiple sclerosis model (TSO)
- 2017 Jan 17 Helminth-induced Ly6Chi monocyte-derived alternatively activated macrophages suppress experimental autoimmune encephalomyelitis -- Full text | PDF
- 2017 Jan 15 Influence of the Gut Microbiome on Autoimmunity in the Central Nervous System -- Full text
- 2016 Nov 24 A parasite-derived 68-mer peptide ameliorates autoimmune disease in murine models of Type 1 diabetes and multiple sclerosis -- Full text | PDF
- 2016 May 25 Intestinal Parasites and Immunomodulation in Neuroinflammatory Disease (chapter of Neuro-Immuno-Gastroenterology)
- 2016 Jan 21 Policy and regulations in light of the human body as a ‘superorganism’ containing multiple, intertwined symbiotic relationships | PDF
- 2016 Sept 1 Acute Strongyloides venezuelensis infection did not prevent EAE development: implications for hygiene hypothesis -- PDF
- 2015 Nov Trichuris suis ova therapy in relapsing multiple sclerosis is safe but without signals of beneficial effect This study used a treatment period of only 12 weeks, which is inadequate when assessing the efficacy of helminths, and it also used a novel TSO formulation with a pH of 5, when it is known that storage of TSO at a pH above 4 may impede its therapeutic effect in humans. [6] The conclusions drawn by the authors of this study about the efficacy of TSO are therefore not reliable.
- 2015 Jul 25 Trichuris suis induces human non-classical patrolling monocytes via the mannose receptor and PKC: implications for multiple sclerosis -- Full text | PDF (TSO)
- 2015 Apr 18 Overcoming Evolutionary Mismatch by Self-Treatment with Helminths: Current Practices and Experience. In 2015, socio-medical research revealed that the human hookworm, Necator americanus (NA), is extremely effective as a treatment for MS, with a success rate of approximately 50% for the progressive forms of the disease (PPMS and SPMS), and more than 90% for the relapsing-remitting form (RRMS)
- 2014 Dec 4 Helminth Therapy for MS (multiple sclerosis)
- 2014 Nov Helminth therapy or elimination: epidemiological, immunological, and clinical considerations
- 2014 Oct 15 Effects of soluble helminth components on human monocytes and macrophages in neuroinflammation. "Overall, our data reveal a potent anti-inflammatory effect of soluble products of T. suis on human myeloid cells, thereby providing increased mechanistic insight into the therapeutical potential of this helminth for MS patients.
- 2014 Apr 29 - TSO PH5 - HINT 2 - Clinical Trial of Helminth-induced Immunomodulatory Therapy (HINT 2) in Relapsing-Remitting Multiple Sclerosis (P3.149) (TSO). This trial employed a novel TSO formulation with a pH of 5, when it is known that storage of TSO at a pH above 4 may impede its therapeutic effect in humans. [7] The conclusions drawn by the authors of this study about the efficacy of TSO are therefore not reliable. NB2 the phase 1 (HINT1 with TSO PH 2.3 was successfull: Probiotic helminth administration in relapsing-remitting multiple sclerosis: a phase 1 study -- Full text | PDF
- 2014 Regulatory B cells, helminths, and multiple sclerosis -- Full text (Part of the book series: Methods in Molecular Biology)
- 2013 Dec 19 Serum levels of brain-derived neurotrophic factor (BNDF) in multiple sclerosis patients with Trichuris suis ova therapy -- Full text | PDF (TSO)
- 2013 Oct 1 Parasite infections in multiple sclerosis modulate immune responses through a retinoic acid-dependent pathway -- Full text | PDF
- 2013 Jun Application of dendritic cells stimulated with Trichinella spiralis excretory-secretory antigens alleviates experimental autoimmune encephalomyelitis -- Full text
- 2013 April 25 Trichuris suis ova in relapsing-remitting multiple sclerosis and clinically isolated syndrome (TRIOMS): study protocol for a randomized controlled trial -- Full text PDF (TSO)
- 2013 Mar Immunomodulatory effects of helminths and protozoa in multiple sclerosis and experimental autoimmune encephalomyelitis -- Full text
- 2013 Mar Helminth therapy and multiple sclerosis -- Full text
- 2012 Sept Immune monitoring of Trichuris suis egg therapy in multiple sclerosis patients (TSO in Secondary Progressive Multiple Sclerosis (SPMS))
- 2012 Aug 24 Does helminth activation of toll-like receptors modulate immune response in multiple sclerosis patients? Full text | PDF
- 2012 Mar Immune modulation by Lacto-N-fucopentaose III in experimental autoimmune encephalomyelitis -- Full text | [8]
- 2012 Jan Neuroprotective potential beyond immunoregulation of helminth infection as a therapeutic target in multiple sclerosis -- Full text
- 2011 Jun Probiotic helminth administration in relapsing-remitting multiple sclerosis: a phase 1 study -- Full text | PDF (TSO). Treatment: Five subjects with newly diagnosed, treatment-naive relapsing-remitting multiple sclerosis (RRMS) were given 2500 TSO orally every 2 weeks for 3 months in a baseline versus treatment control exploratory trial. Results: The mean number of new gadolinium-enhancing magnetic resonance imaging (MRI) lesions (n-Gd+) fell from 6.6 at baseline to 2.0 at the end of TSO administration (NB HINT2[9] and [10] - was done with a version of TSO at pH 5.0, which is known to be less effective than the TSO product at pH 2.4 that is commercially available and was used in Weinstock's early trials.)
- 2011 Apr Helminths and multiple sclerosis: will old friends give us new treatments for MS? (No abstract)
- 2011 May Experimental autoimmune encephalomyelitis evolution was not modified by multiple infections with Strongyloides venezuelensis -- Full text
- 2011 Taenia crassiceps infection abrogates experimental autoimmune encephalomyelitis -- Full text. "The Taenia crassiceps-induced immune regulation decreased experimental autoimmune encephalomyelitis severity by dampening T cell activation, proliferation and migration to the CNS."
- 2010 Oct Infection of non-encapsulated species of Trichinella ameliorates experimental autoimmune encephalomyelitis involving suppression of Th17 and Th1 response -- Full text
- 2010 Jun Mechanisms of modulation of experimental autoimmune encephalomyelitis by chronic Trichinella spiralis infection in Dark Agouti rats -- Full text
- 2009 Nov 1 Helminth antigens modulate immune responses in cells from multiple sclerosis patients through TLR2-dependent mechanisms -- Full text | PDF
- 2009 Mar 5 Worms for Immune Regulation of Multiple Sclerosis (WIRMS) Proposal for the first Phase 2 trial using a controlled number of Necator americanus in the treatment of Multiple Sclerosis. (Also reported by Science Daily [11] and the Mail Online. [12]) (NA)
- 2008 Apr Trichinella spiralis: modulation of experimental autoimmune encephalomyelitis in DA rats -- Full text
- 2007 Dec Resistance to experimental autoimmune encephalomyelitis development in Lewis rats from a conventional animal facility -- Full text
- 2007 Feb Association between parasite infection and immune responses in multiple sclerosis -- PDF (Also reported by Science Daily [13] and the BBC. [14]). In 2007, Correale and Farez demonstrated that patients with multiple sclerosis who were accidentally colonised by one or more of a variety of helminths experienced a reduced number of disease exacerbations compared with patients who were helminth-free. This was the first study to explore the effect of helminth infection on immune response and the natural course of Relapsing Remitting Multiple Sclerosis. It showed that MS progressed much more slowly in patients who hosted intestinal worms.
- 2007 Jul Paralysis of CD4(+)CD25(+) regulatory T cell response in chronic autoimmune encephalomyelitis -- Full text
- 2006 Dec 12 Multiple sclerosis and the hygiene hypothesis
- 2003 Sept Schistosomiasis decreases central nervous system inflammation and alters the progression of experimental autoimmune encephalomyelitis -- Full text | PDF
- 2003 Jan Immunomodulation of experimental autoimmune encephalomyelitis by helminth ova immunization -- Full text | PDF
- 2002 Jun 3 Immunoregulation of CNS autoimmunity by helminth and mycobacterial infections -- Full text
Ongoing research projects :
- 2023-2026 - Leveraging helminth infection to limit neuroinflammation in MS (Dr. Lisa Osborne, University of British Columbia)
For more research on helminths and MS, use the search function on your device (Control+F on a PC, Command+F on a Mac or 'Find in page' in the drop-down menu from the three dots icon on a mobile) to search the following page for references to “multiple sclerosis” (rather than “MS”).
Comments by researchers[edit | edit source]

For more comments by researchers about helminthic therapy in general, see the following list.
The anecdotal evidence[edit | edit source]
To read the experience of those who have adopted helminths to treat MS, see the following section of the Helminthic Therapy Personal Stories page.
Reporting your own experience[edit | edit source]
To report your personal experience of using helminthic therapy to treat MS, please use our bespoke reporting tool.
Best helminth species to treat MS[edit | edit source]
In 2015, Cheng et al, reported that:

This study found a couple of individuals who had used HDC to treat MS. One of them reported a 40% success rate using HDC alone, while the other reported 100% success by combining HDC with NA. Seven NA users with RRMS all reported a 100% success rate, as did someone who combined TSO with NA.
The MS personal stories reported in this wiki are almost exclusively from NA hosts (see, Helminthic therapy personal stories: MS), so NA is clearly the go-to species for MS. For details of how to use NA, see Self-treating with NA.
Further reading[edit | edit source]
Given that helminthic therapy can take a while to begin producing benefits (up to 2 years in the case of NA [16]), it can help to have alternative treatment options to turn to while waiting for the worms to begin to work. The following document contains a wide range of alternative, mostly science-based, natural approaches.