Tick-borne infection

Lyme Disease

Exposure history, migrating symptoms, neurologic signs, arthritis, and relapse patterns. Organize your symptom timeline, co-infection clues, and treatment history for an LLMD-informed evaluation.

Causes and drivers

Lyme disease begins with Borrelia exposure, then the full illness picture depends on timing, spread, co-infections, and inflammatory load.

CDC describes Lyme disease as a Borrelia infection spread by blacklegged tick bites. The uploaded Horowitz materials add the MSIDS lens: persistent illness can involve Borrelia forms, biofilms, Babesia, Bartonella, mold, MCAS, dysautonomia, sleep disruption, hormones, pain generators, and immune inflammation.

Exposure and early infection

Tick bites, outdoor exposure, travel, pets, rashes, summer flu, fever, chills, swollen glands, severe headache, facial weakness, heart symptoms, and symptom onset date are core data for a Lyme-informed clinician.

Disseminated or persistent patterns

Migrating joint pain, nerve pain, numbness, tingling, cognitive slowing, sleep disruption, fatigue, palpitations, dizziness, facial palsy, and symptoms that flare cyclically can justify a deeper Lyme and co-infection workup.

MSIDS overlap

Sweats, air hunger, foot pain, shin pain, neuropsychiatric flares, mold exposure, MCAS symptoms, POTS-like symptoms, medication sensitivity, and GI intolerance can change the treatment sequence.

Clinician-supervised treatment protocols

Horowitz DDDCT & HDDCT: comprehensive Lyme treatment using dapsone combination therapy.

Dr. Richard Horowitz has been researching and refining dapsone-based combination therapy for persistent Lyme disease since 2016. His protocols progress through stages: foundational MSIDS stabilization, then Double Dose Dapsone Combination Therapy (DDDCT), followed by pulsed High Dose Dapsone Combination Therapy (HDDCT) for patients who plateau. Every stage requires clinician supervision with lab monitoring.

Horowitz DDDCT — foundational persister therapy

Double Dose Dapsone Combination Therapy — for persistent/chronic Lyme and PTLDS

DDDCT is the first advanced-stage protocol in Horowitz's persister treatment sequence. It is used after patients have been stabilized with the MSIDS framework and after standard oral combination antimicrobials have been insufficient. Horowitz published two prior dapsone studies before the 2023 paper: an initial DDDCT study showing 98% improvement with 45% remaining in remission for 1 year or longer in non-Bartonella patients [ref 102], and a 4-day pulse HDDCT study showing 32% (8/25) had resolution of all active Lyme symptoms for 3+ months [ref 103]. The 2023 Horowitz, Fallon, Freeman study in 25 PTLDS patients with bartonellosis found 100% improved, with 7/23 (30.5%) in remission 3–9 months after 8-week DDDCT + 5–7 day HDDCT.

DDDCT medication regimen (exact protocol from 2023 paper, Table 2)

Timeframe Medications Dose
Pre-DDDCT ramp (before week 1) Plaquenil (hydroxychloroquine), doxycycline (or minocycline), rifampin, Nystatin (Rx), pyrazinamide (Rx) Plaquenil 200 mg bid, doxycycline 100 mg bid, rifampin 300 mg bid, Nystatin 500,000 U bid (Rx antifungal), pyrazinamide (weight-based: ≤55 kg = 1000 mg/day, 56–75 kg = 1500 mg/day, 76–90 kg = 2000 mg/day)
Week 1 Add dapsone 25 mg QD + leucovorin (Rx) + L-methyl folate Dapsone 25 mg once daily, leucovorin 25 mg 2 tablets bid (50 mg bid) (Rx), L-methyl folate 15 mg 2 tablets bid (60 mg/day)
Week 2 Increase dapsone Dapsone 25 mg bid (50 mg/day). Continue all above medications.
Week 3 Increase dapsone. Order labs. Dapsone 50 mg am, 25 mg pm (75 mg/day). CBC, CMP, baseline methemoglobin at end of week.
Week 4 Increase dapsone. Add methylene blue. Add cimetidine if indicated. Dapsone 50 mg bid (100 mg/day). Methylene blue 50 mg bid for methemoglobin control. Cimetidine 400 mg bid if history of Herxheimer reactions.
Weeks 5–8 (DDDCT) Double-dose dapsone. Add macrolide. Double folate support. Dapsone 100 mg bid (200 mg/day). Azithromycin 250 mg bid (or clarithromycin alt.). Leucovorin 25 mg 4 tablets bid (100 mg bid). L-methyl folate 15 mg 4 tablets bid (60 mg bid).
Weeks 5–8 (alt. rifamycin) Rifabutin may substitute for rifampin Rifabutin 150 mg bid (300 mg/day) replaces rifampin for patients intolerant of rifampin or on interacting medications. Doxycycline may substitute for minocycline.

DDDCT supplement protocol (Table 1 from 2023 paper + Substack guidance)

Timeframe Supplement Dose & Notes
Pre-DDDCT
(biofilm prep)
Cinnamon/clove/oregano oil 1 capsule twice daily (Doctor Inspired Formulations, Hopkinton Drug Compounding)
Biocidin 2 sprays twice daily (Biocidin Botanicals)
Stevia 15 drops twice daily (NutraMedix)
Peppermint oil 1 capsule twice daily. Argentyn 23 silver 1 tsp bid + EDTA suppositories during final week for severe/resistant cases
Pre-DDDCT
(microbiome)
Orthobiotic 1 capsule twice daily, first thing AM and last thing PM (Ortho Molecular Products)
Saccharomyces boulardii 1 capsule twice daily (Ortho Molecular Products)
Theralac 1 capsule twice daily (Master Supplements)
Probiomax 350 billion ½ packet once daily, can increase to twice daily if loose stools (Xymogen)
Pre-DDDCT
(detox & anti-inflammatory)
NAC (N-Acetyl Cysteine) 600 mg twice daily (Xymogen)
Glutathione (liposomal) 4 capsules × 250 mg twice daily = 1000 mg bid (Ortho Molecular or Essential Pro Glutathione, Wellness Pharmacy)
Alpha lipoic acid (Alamax) 600 mg twice daily (Xymogen)
Curcumin (Curcuplex) 500 mg twice daily (Xymogen)
Sulforaphane glucosinolate (Oncoplex ES) 100 mg twice daily (Xymogen)
Vitamin C 1–2 g twice daily (Xymogen)
Vitamin E 300 IU twice daily (Designs for Health)
NADH (ENADA) 5 mg twice daily (ENADA Nutraceuticals)
Herx rescue Alka-Seltzer Gold As needed for temporary symptom flares. Take with 2 g glutathione all at once, up to 3 times daily until reaction resolves
Sodium bicarbonate Alternative to Alka-Seltzer Gold for Herxheimer rescue
Glutathione (extra) Up to 2000 mg 3 times daily for methemoglobin symptoms (blue hands/lips, headache, fatigue, shortness of breath)
Weeks 1–4
(folate rescue)
L-methyl folate 15 mg, 2 tablets twice daily = 60 mg/day. Continue all pre-DDDCT supplements
Leucovorin (folinic acid) 25 mg, 2 tablets twice daily = 50 mg bid. Prescription folate rescue. Continue all pre-DDDCT supplements
B12 (methylcobalamin) Substack recommendation: add B12 support to help reduce dapsone-induced anemia alongside iron if ferritin is low
Iron (if deficient) Substack recommendation: check ferritin; supplement if low to support red blood cell production during dapsone therapy
Weeks 5–8
(DDDCT double-dose)
L-methyl folate (doubled) 15 mg, 4 tablets twice daily = 60 mg bid = 120 mg/day total. Folic acid dosing doubles on double-dose dapsone
Leucovorin (doubled) 25 mg, 4 tablets twice daily = 100 mg bid. Continue B12/iron support. Continue all pre-DDDCT biofilm, microbiome, detox, and anti-inflammatory supplements

Substack additional recommendations (Horowitz 2025):

  • Clotrimazole (Mycelex) troches 10 mg 4× daily as needed for oral yeast/Candida during protocol, especially if sugar-free/yeast-free diet is not sufficient.
  • Methylene blue timing: Taken with high-dose antioxidants (glutathione 1000–2000 mg bid, vitamin C 1–2 g bid, vitamin E 300 IU bid, NADH 5 mg bid) to help reverse methemoglobin levels. Substack notes this antioxidant combination is critical during both DDDCT weeks 4–8 and HDDCT pulse days.
  • Cimetidine 400 mg bid: May be added from week 4 onward if patient has a history of severe Herxheimer reactions. Acts as a CYP450 inhibitor to slow dapsone metabolism and reduce inflammatory flare intensity.

Post-DDDCT: If symptoms persist or plateau, patients transition to HDDCT 5–7 day pulse therapy (see next tab). CBC, CMP, and methemoglobin are monitored biweekly during weeks 5–8 and at the end of each HDDCT pulse. All lab values returned to normal at the end of treatment in the published study, except for one patient with pre-existing low platelets.

* DDDCT requires a trained clinician. Before starting dapsone: G6PD must be positive/normal. B12, folate, and iron must not be deficient. Baseline ECG must be normal. A drug interaction check is required (rifampin affects medication levels). Do not self-prescribe. *

Detailed clinical picture

Lyme can be early, disseminated, late, persistent, or part of a broader illness pattern.

Patients are best served when the story is specific: where exposure happened, what appeared first, what migrated, what flares, what improves, and what has already been ruled out.

Symptoms that fit Lyme or Lyme-MSIDS

  • Skin and early illness: expanding rash, solid red rash, flu-like onset, fever, chills, swollen glands, unusual fatigue, headache, and neck stiffness.
  • Neurologic: facial droop, nerve pain, numbness, tingling, burning, sound/light sensitivity, cognitive slowing, dizziness, tremor, and sleep disruption.
  • Musculoskeletal: migrating joint pain, tendon pain, muscle pain, swelling of one large joint, rib or chest wall pain, and flares that move around the body.
  • Cardiac/autonomic: palpitations, chest pressure, faintness, shortness of breath, heart-rate swings, POTS-like symptoms, and heat intolerance.

Evidence that helps the clinician

  • Known tick bite, high-risk outdoor exposure, pets that bring ticks indoors, travel to endemic areas, or repeated exposure through work, gardening, hunting, hiking, or camping.
  • Photos of rashes or joint swelling, documented fever, abnormal CBC or liver enzymes, prior positive or indeterminate Lyme bands, and symptom change after antimicrobial treatment.
  • Co-infection clues such as Babesia-type sweats or air hunger, Bartonella-type foot pain or neuropsychiatric flares, or anaplasma/ehrlichia-type low white cells and platelets.
  • Environmental load: mold exposure, chemical sensitivity, MCAS symptoms, dysautonomia, sleep apnea, hormone shifts, nutrient deficiencies, and medication intolerance.

Lyme-focused differential guide

Clinical focus Why it matters Patient evidence to bring
Early rash or summer flu An erythema migrans rash can be diagnostic, but many patients never see a classic bullseye. Flu-like illness after exposure still matters. Photos, dates, location of bite or rash, fever log, urgent-care notes, and any early antibiotic history.
Migrating or relapsing symptoms Migrating pain, neurologic symptoms, and cyclic flares can support a tick-borne pattern when placed in context with exposure and testing. A one-page timeline showing first symptom, worst symptom, flare cycle, treatment response, and current functional limits.
Co-infection and environmental burden Babesia, Bartonella, Anaplasma, Ehrlichia, Rickettsia, relapsing fever Borrelia, mold/CIRS, MCAS, POTS, and non-tick diagnoses can overlap. Symptom checklist, abnormal labs, prior diagnoses, mold history, medication reactions, and travel or animal exposure.
Testing timing and interpretation Early testing can be negative before antibodies form, and late or immune-suppressed patients may need a broader interpretation. All prior Lyme panels, Western blot or immunoblot bands, dates of testing, antibiotic timing, and lab reference ranges.

Recommended Lyme/MSIDS tests to discuss with a clinician

Testing category Horowitz / Kinderlehrer / Mozayeni-informed focus Common tests and labs to discuss
Core Lyme testing Horowitz and Kinderlehrer both emphasize that Lyme is a clinical diagnosis supported by exposure history, symptoms, and labs; early negative tests do not end the workup when the history is strong. CDC two-tier or modified two-tier EIA, C6/VlsE when available, IgM/IgG immunoblot or expanded immunoblot, Borrelia PCR from synovial fluid/CSF/biopsy when clinically indicated, and repeat testing when timing was too early.
Expanded Borrelia coverage Kinderlehrer and Horowitz both warn that non-B. burgdorferi species and relapsing fever Borrelia can be missed by narrow Lyme panels. Multi-species Lyme immunoblot, relapsing fever Borrelia testing, Borrelia miyamotoi PCR/serology, European species coverage when travel or immigration history fits, and tick testing only as exposure evidence, not proof of patient infection.
Co-infection screen Horowitz's MSIDS workup and Kinderlehrer's clinical approach both prioritize co-infections when symptoms do not fit Lyme alone. Mozayeni's Bartonella framework is especially relevant when vascular, neurologic, psychiatric, foot-pain, shin-pain, or striae clues appear. Bartonella henselae/quintana/vinsonii/koehlerae IFA, PCR, FISH, Galaxy ePCR/BAPGM when available; Babesia microti/duncani/divergens testing by smear, PCR, FISH, IFA; Anaplasma, Ehrlichia, Rickettsia, tularemia, and Mycoplasma PCR or serology when symptoms and geography fit.
MSIDS inflammatory and immune labs Horowitz's MSIDS model asks what is keeping the patient sick besides Borrelia: inflammation, immune dysfunction, mold/CIRS, MCAS, endocrine stress, mitochondrial stress, and nutritional deficits. CBC with differential, CMP, ESR, CRP, ferritin/iron, B12, folate, vitamin D, thyroid panel with antibodies, ANA/RF/autoimmune screen when indicated, immunoglobulins/IgG subclasses, CD57 NK cells as a non-diagnostic immune marker, cytokine or complement markers when clinically useful.
Mold/CIRS overlap Horowitz and Kinderlehrer both include environmental illness in complex chronic Lyme workups when the pattern suggests mold sensitivity, MCAS, or detox intolerance. VCS screening, HLA-DR/DQ, C4a, TGF-beta1, MMP-9, MSH, VIP, VEGF, ADH/osmolality, leptin, ACTH/cortisol, MARCoNS culture, ERMI/HERTSMI-2 building testing, and urine mycotoxins when a trained clinician thinks results will change the plan.
DDDCT/HDDCT safety labs Horowitz's dapsone protocols require safety infrastructure before and during treatment; these tests are monitoring requirements, not diagnostic proof of Lyme. G6PD before dapsone, CBC with differential, CMP, bilirubin, reticulocytes, methemoglobin, folate/B12 status, pregnancy test when relevant, ECG/QT review for interacting drugs, medication interaction review, and repeat labs at clinician-defined intervals.

* Recommended tests are not a checklist every patient must complete. A Lyme-literate clinician should prioritize tests by exposure, symptoms, risk, budget, and whether the result will change care. *

Educational images

Borrelia burgdorferi: spirochetes, biofilms, and persister forms.

Microscopy and clinical images from CDC Public Health Image Library and Wikimedia Commons. All images are public domain or freely licensed for educational use.

CDC microscopy image of Borrelia burgdorferi spirochetes

Borrelia burgdorferi — CDC microscopy

CDC microscopy image showing Borrelia burgdorferi spirochetes. Source: CDC Public Health Image Library, public domain.

Scanning electron micrograph of Borrelia burgdorferi biofilm — figure from Sapi et al. 2012 PLoS One showing biofilm aggregate structure

Borrelia biofilm — SEM microscopy (Sapi et al., 2012)

Scanning electron micrograph from Dr. Eva Sapi's landmark PLoS One study. Shows the protective extracellular matrix (EPS) surrounding aggregated Borrelia spirochetes. Individual bacteria, round bodies, and cyst forms are embedded within this polysaccharide matrix, which blocks antibiotics and immune cells — bacteria within biofilms can be up to 1,000× more resistant. Full study — open access, all figures available. Source: Sapi et al. (2012) PLoS One, CC-BY license.

Borrelia burgdorferi biofilm at high magnification showing round body/cyst forms embedded in biofilm matrix — from Sapi et al. 2012 PLoS One

Biofilm with cyst forms (round bodies) — Sapi et al., 2012

High-magnification image from the Sapi biofilm study showing the heterogeneous morphology within Borrelia biofilms. Round body/cyst forms (dormant, spherical) are visible alongside active spirochetes, all embedded in the protective EPS matrix. When threatened by antibiotics, Borrelia converts to dormant cysts within hours. These metabolically inactive forms are invisible to cell-wall-targeting antibiotics. When antibiotics are withdrawn, cysts revert to active spirochetes and resume infection. Persisters: A subpopulation within these biofilms enters deep metabolic dormancy — the specific target of dapsone-based DDDCT/HDDCT therapy.

Erythema migrans - classic bullseye rash of Lyme disease

Erythema migrans (EM) rash

The classic bullseye rash is diagnostic of Lyme disease, appearing in ~14–30% of patients. Rashes can be solid red, multiple, or absent. Early treatment during the EM stage has the highest success rate. Source: CDC/James Gathany, 2007, public domain.

Ixodes scapularis - blacklegged deer tick, primary vector of Lyme disease

Ixodes scapularis (deer tick)

The blacklegged tick is the primary vector for Lyme disease (Borrelia burgdorferi), Babesiosis (Babesia microti), and Anaplasmosis (Anaplasma phagocytophilum) in the northeastern and midwestern United States. Nymph-stage ticks are most likely to transmit infection due to their small size. Source: Wikimedia Commons, CC-licensed.

Research and clinical sources

Lyme patients need both evidence-aware treatment and a clinician who can manage risk.

These sources are not a self-treatment kit. They help patients understand what an LLMD-informed practitioner may evaluate.

Do not wait on these symptoms

Seek urgent medical care for facial droop, fainting, chest pain, new irregular heartbeat, severe headache, stiff neck, confusion, weakness, pregnancy with fever after exposure, or rapidly worsening illness.

  • Bring tick exposure details even if no tick was found.
  • Clinicians should evaluate Lyme carditis, meningitis, rickettsial disease, anaplasmosis/ehrlichiosis, or Babesia urgently when symptoms fit.

Sources used on this page

  • Horowitz, R.I. (2016–2017). Initial clinical use of dapsone for chronic Lyme persisters. How Can I Get Better? An Action Plan for Treating Resistant Lyme and Chronic Disease. St. Martin's Press. First published clinical description of dapsone as a persister drug in the context of the MSIDS 16-point model. Introduced the concept that dapsone combined with a tetracycline and rifampin targets multiple morphological forms of Borrelia (spirochetes, round bodies, biofilms).
  • Horowitz, R.I. and Freeman, P. (2019–2022). Clinical studies refining Double Dose Dapsone Combination Therapy (DDDCT). First DDDCT study [2022]: 98% of patients improved; 45% remained in remission for 1 year or longer in patients without Bartonella. In PTLDS patients with EM rashes, 100% improved and 58% achieved long-term remission. However, FISH-positive Bartonella patients did not achieve long-term remission on DDDCT alone. Four-day HDDCT pulse study: 32% (8/25) had complete resolution of all active Lyme symptoms for 3+ months post-treatment, even with prior active co-infections. In the Bartonella-exposed subgroup, 79% (15/19) improved. Higher dapsone dosage, not just longer treatment, positively affected outcomes.
  • Horowitz, Fallon, and Freeman (2023). “Comparison of the Efficacy of Longer versus Shorter Pulsed High Dose Dapsone Combination Therapy in the Treatment of Chronic Lyme Disease/Post Treatment Lyme Disease Syndrome with Bartonellosis and Associated Coinfections.” Microorganisms, 11(9), 2301. Retrospective chart review of 25 patients with bartonellosis. DDDCT (8 weeks, dapsone 100 mg bid + doxycycline 100 mg bid + rifampin 300 mg bid + pyrazinamide + Plaquenil + azithromycin + methylene blue + Nystatin) followed by 5–7 day HDDCT pulses. 100% improved. 6–7 day pulses superior to 4-day pulses when Bartonella present. 7/23 (30.5%) remission 3–9 months. Includes detailed supplements table (biofilm agents, probiotics, NAC, glutathione, alpha lipoic acid, curcumin, sulforaphane, vitamin C/E, NADH, leucovorin, L-methyl folate).
  • Horowitz, R.I. (2024). Babesia & dapsone clinical series. Medical Detective Substack. Discussion of dapsone's role in Babesia treatment, tafenoquine-dapsone overlap concerns (methemoglobin additive risk), and anti-Babesia protocol sequencing.
  • Horowitz, R.I. (2025, January–March). Bartonella series. Medical Detective Substack. February 19: Bartonella as the Second Great Imitator. February 26: DDDCT for Bartonella with companion drug dosing tables and safety supplements. March 5: Two-week pulsing strategy for Bartonella persisters post-DDDCT/HDDCT.
  • Horowitz, R.I. (2025, ongoing). MSIDS updates, persister research, and clinical refinements published continuously on the Medical Detective Substack platform and at cangetbetter.com.
  • CDC: Clinical Care of Lyme Disease
  • CDC: Signs and Symptoms of Untreated Lyme Disease
  • ILADS Treatment Guidelines
  • Richard I. Horowitz, MD, How Can I Get Better?
  • Richard I. Horowitz, MD, Why Can't I Get Better?
  • Daniel A. Kinderlehrer, MD, Recovery From Lyme Disease
  • Stephen Harrod Buhner, Healing Lyme Disease Coinfections
  • Fallon and Sotsky, Conquering Lyme Disease
Patient advocacy

LADA's role is navigation, not diagnosis.

Persistent symptoms deserve careful reassessment. The goal is to help patients organize causes, symptoms, treatment history, safety risks, and practitioner options while avoiding unsafe do-it-yourself treatment.