Tick-borne infection guide
Lyme disease
Lyme borreliosis is a bacterial infection caused by members of the Borrelia burgdorferi sensu lato complex and transmitted by infected Ixodes ticks. It is not one vague syndrome: different stages of infection have recognizable clinical patterns, and the value of a test depends heavily on when and why it is ordered.
What it is
A tissue-disseminating spirochetal infection
Lyme disease is caused by spiral-shaped bacteria called spirochetes. In North America the major human pathogen is Borrelia burgdorferi; other members of the broader B. burgdorferi sensu lato group cause disease in Europe and Asia. The organisms cycle between vertebrate reservoir hosts and hard-bodied Ixodes ticks. Humans are incidental hosts.
After an infected tick feeds, organisms deposited in skin can multiply locally and move through tissue. In untreated infection they can disseminate to other skin sites and, in some patients, the nervous system, heart, or joints. Borrelia expresses different surface proteins during its tick and mammalian phases, adheres to host tissues, and uses multiple immune-evasion strategies. Host inflammation contributes to symptoms and tissue injury as the immune system responds to the organism.
A 2026 Nature Reviews Disease Primers review describes erythema migrans as the earliest characteristic manifestation, typically developing about 7–14 days after a bite; untreated infection can later involve the nervous system or heart, and later manifestations can include Lyme arthritis. Geographic species differences help explain why the clinical spectrum is not identical everywhere. 2026 peer-reviewed primer ↗
Clinical picture
Symptoms depend on where the infection is in its course.
Early localized infection
The classic early finding is erythema migrans (EM), an expanding red skin lesion at or near the bite site. It does not always look like a perfect bull's-eye. People can also have fever, chills, fatigue, headache, muscle aches, joint aches, and swollen lymph nodes. A typical EM lesion in an epidemiologically plausible setting can be diagnosed clinically because antibodies may still be negative early.
Early disseminated disease
If untreated, organisms can disseminate. Recognized manifestations include multiple EM lesions, facial nerve palsy and other cranial neuropathies, meningitis or radiculoneuritis, and Lyme carditis. Carditis can disturb electrical conduction through the heart; symptoms such as fainting, palpitations, chest pain or shortness of breath deserve prompt medical assessment.
Late manifestations
In North America, late Lyme arthritis most often causes objective swelling of one or a few large joints, especially the knee. Neurologic manifestations are less common but can occur. Persistent fatigue, pain or cognitive complaints after recommended antibiotic treatment are real symptoms, but they are not by themselves proof of ongoing active Borrelia infection; modern reviews distinguish post-treatment symptoms from objective evidence of treatment failure.
Testing
Why timing matters so much
CDC recommends FDA-cleared antibody tests used in a two-step algorithm for most laboratory diagnosis. The tests measure the immune response to Borrelia—not the bacterium itself. Because antibody production takes time, serology can be falsely negative during the first few weeks, particularly when an EM rash is present. After several weeks, sensitivity improves. Once antibodies develop, they can remain detectable for months or years and therefore cannot be used as a simple test of cure. CDC testing guidance ↗
Useful distinction: a typical EM rash in an appropriate exposure setting is generally a clinical diagnosis. For other manifestations, clinicians combine symptoms, exposure probability, physical findings and appropriate serology. A positive antibody result without a compatible clinical picture does not automatically explain nonspecific symptoms.
After a tick bite
The IDSA/AAN/ACR guideline recommends identifying the tick species but recommends against using a removed tick's B. burgdorferi test result to predict whether the person became infected. For a clearly high-risk Ixodes bite meeting guideline criteria, single-dose doxycycline prophylaxis may be considered within 72 hours of tick removal; that decision is based on the bite's risk characteristics, not a tick PCR result. Guideline ↗
Standard medical treatment
Antibiotics are the evidence-based treatment.
Regimens depend on the manifestation, age, pregnancy status, allergy history and whether the nervous system or heart is involved. For uncomplicated early EM, CDC lists doxycycline, amoxicillin or cefuroxime axetil as standard oral options, with commonly recommended courses in the roughly 10–14 day range depending on the drug. Neurologic, cardiac and arthritic manifestations have their own evidence-based regimens and may require different routes or durations. CDC early-Lyme treatment table ↗
The practical message is not “every tick bite needs antibiotics.” It is that recognized Lyme disease is treatable, and the correct regimen should be matched to the actual manifestation. Repeated or prolonged antimicrobial courses have not shown benefit for nonspecific persistent symptoms in the absence of objective evidence of active infection and can create meaningful risks.
Botanical / experimental evidence
What has actually been tested in the laboratory?
Some herbs commonly discussed in Lyme communities have been put through direct B. burgdorferi laboratory testing. That is more meaningful than a testimonial, but it is still a long way from proving clinical benefit. A Johns Hopkins–affiliated 2020 study screened botanical extracts against growing and stationary-phase B. burgdorferi cultures.
| Botanical | What the study reported | Evidence level |
|---|---|---|
| Cryptolepis sanguinolenta | Strong activity against growing and stationary-phase cultures; 1% extract produced no regrowth in the study's subculture experiment. | In vitro only |
| Japanese knotweed (Polygonum cuspidatum) | Activity against growing and stationary-phase cultures in the same model. | In vitro only |
| Black walnut (Juglans nigra) | Activity against stationary-phase organisms in the screening model. | In vitro only |
| Sweet wormwood (Artemisia annua) | Activity against stationary-phase culture, but less convincing activity against growing organisms. | In vitro only |
| Cat's claw (Uncaria tomentosa) | Activity against stationary-phase culture at tested extract concentrations. | In vitro only |
| Cistus and Chinese skullcap | Showed activity in the same culture screen. | In vitro only |
That study also found little or no activity in its model for several products often promoted online, including Stevia, Andrographis, grapefruit-seed extract, colloidal silver and monolaurin. Read the botanical screening study ↗
A 2023 University of Maryland review examined 18 herbal supplements—including protocols associated with Dr. Rawls and Stephen Buhner—and concluded that some herbs have laboratory anti-Borrelia activity and many have anti-inflammatory effects, but human clinical trials demonstrating efficacy are lacking. The authors also highlighted drug interactions and risks involving bleeding, blood pressure and blood sugar. Read the clinical review ↗
What the evidence means: “active in a culture dish” means the extract affected bacteria under laboratory conditions. It does not tell us what oral dose reaches infected human tissues, whether the active constituents are absorbed, whether a safe concentration is achievable, or whether symptoms improve in a controlled human trial. These herbs belong in the category biologically interesting, clinically unproven—not “cure.”
Key sources
Strle et al., Nature Reviews Disease Primers (2026)
Current peer-reviewed overview of epidemiology, pathogenesis, diagnosis and management.
Read source ↗CDC — Testing and Diagnosis for Lyme disease
Two-step antibody testing, early false negatives and persistent antibodies.
Read source ↗AAN/ACR/IDSA Lyme disease guideline
Clinical diagnosis of typical EM, testing strategy and post-bite prophylaxis criteria.
Read source ↗Feng et al., Frontiers in Medicine (2020)
Direct in-vitro screening of commonly used botanical medicines against B. burgdorferi.
Read source ↗Thompson et al. (2023)
Academic review of commonly used Lyme herbal supplements, evidence gaps, adverse effects and interactions.
Read source ↗When not to wait
Seek prompt medical evaluation for an expanding erythema migrans-type rash, new facial weakness, severe headache/neck stiffness, fainting, significant palpitations or chest symptoms after possible tick exposure. Lyme carditis and neurologic Lyme require clinician assessment.
Seek prompt medical evaluation for an expanding erythema migrans-type rash, new facial weakness, severe headache/neck stiffness, fainting, significant palpitations or chest symptoms after possible tick exposure. Lyme carditis and neurologic Lyme require clinician assessment.
Botanicals discussed in the research
Related products
These Amazon links are for products containing botanicals discussed in published laboratory research. The commercial products themselves were not tested in those studies, and laboratory activity does not establish that a supplement treats Lyme disease in people.
Products I used + practical support
Products worth knowing about
Cryptolepis and artemisinin are the two products I personally used during my Babesia experience. I am sharing what I used, not prescribing a treatment. The other items are practical support products people may find useful while keeping track of medications, supplements, and hydration.
What I personally used
Cryptolepis sanguinolenta
The Cryptolepis product I personally used. See the Cryptolepis page for the research, limitations, and my experience.
View Cryptolepis on AmazonAmazon affiliate link
What I personally used
Artemisinin
The artemisinin product I personally used. See the Artemisinin page for the research, limitations, and my experience.
View Artemisinin on AmazonAmazon affiliate link
Practical support
Large weekly pill organizer
A simple way to keep prescriptions and supplements organized when a routine gets complicated.
View pill organizer on AmazonAmazon affiliate link
Practical support
Hydration / electrolyte packets
Convenient hydration support for people who want an easy electrolyte option. This is not a Babesia treatment.
View hydration packets on AmazonAmazon affiliate link
Amazon disclosure: As an Amazon Associate I earn from qualifying purchases. Buying through an affiliate link may earn Beat Babesia a commission at no additional cost to you.