Up to 40% of Lyme patients in endemic areas carry at least one co-infection. Different pathogens attack different organ systems and cell types — which is why the symptom picture varies so significantly between patients. Understanding these differences serves two purposes: it helps you recognise patterns in your own experience, and it helps you have more targeted conversations with a knowledgeable practitioner about what to test for. This is not a diagnostic tool — it is an orientation map.
Each co-infection requires a different treatment approach. Babesia needs antiparasitic drugs — standard Lyme antibiotics don't touch it. Bartonella needs rifampin-based protocols. Ehrlichia and Anaplasma respond well to doxycycline — which also covers Lyme — so they are often treated simultaneously. Knowing which infections are likely present shapes which treatment approach is appropriate. A patient who isn't improving on Lyme antibiotics alone may have an unaddressed co-infection driving the remaining symptoms.
Lyme disease — Borrelia burgdorferi
Babesia — the infection that changes the air
Bartonella — when the brain is the battlefield
Ehrlichia & Anaplasma — sudden, severe, laboratory-visible
Rickettsia — fast, dangerous, treatable
At a glance — symptom matrix
This matrix compares the most clinically useful distinguishing features across the main co-infections. Use it to identify which infections might be worth investigating based on your symptom pattern.
| Symptom / Feature | Borrelia | Babesia | Bartonella | Ehrlichia | Rickettsia |
|---|---|---|---|---|---|
| Migratory joint pain | ✓✓ | sometimes | sometimes | sometimes | — |
| Air hunger / breathlessness | — | ✓✓ | — | — | — |
| Drenching night sweats | mild | ✓✓ | sometimes | — | — |
| Rage / severe anxiety | sometimes | sometimes | ✓✓ | — | — |
| Burning foot pain | — | — | ✓✓ | — | — |
| Skin streaks (striae) | — | — | ✓✓ | — | — |
| High fever (acute onset) | early only | ✓✓ | low-grade | ✓✓ | ✓✓ |
| Lymph node swelling | sometimes | — | ✓✓ | — | — |
| ↓ Low WBC on bloodwork | — | — | — | ✓✓ | — |
| ↓ Low platelets | — | sometimes | — | ✓✓ | — |
| ↑ Elevated liver enzymes | rare | sometimes | — | ✓✓ | sometimes |
| Neurological symptoms | ✓✓ | sometimes | ✓✓ | severe cases | severe cases |
| Cyclic / relapsing pattern | ✓✓ | ✓✓ | ✓✓ | — | — |
| Rash | EM (50–70%) | — | — | children mostly | ✓✓ petechial |
| Cardiac symptoms | ✓✓ heart block | chest pain | endocarditis | — | — |
✓✓ = characteristic feature · sometimes = possible but not defining · — = uncommon or absent
Symptom patterns that point to specific infections
Certain symptom combinations are particularly suggestive of specific co-infections. These are not diagnostic — but they are the patterns experienced LLMD practitioners use to guide testing decisions.
The combination of air hunger (feeling unable to get enough breath even at rest), drenching night sweats, and waves of fever with chills is the most characteristic Babesia picture. If you're on Lyme treatment and these persist — Babesia is likely untreated.
This laboratory triad in a patient with summer fever and tick exposure is highly suggestive. The combination of leukopenia, thrombocytopenia, and elevated transaminases is unusual in uncomplicated Lyme disease and almost never occurs in flu.
A rash that begins on the extremities and spreads toward the trunk — especially with a dark scab at the bite site — in a febrile patient needs urgent consideration of Rickettsia. This is a medical emergency and should not wait for laboratory confirmation.
When standard Lyme treatment isn't enough
If you are being treated for Lyme disease and are not improving as expected — or are improving in some areas but remaining stuck in others — specific symptom clusters can suggest which co-infection may be untreated.
Antibiotic treatment for Lyme has no effect on Babesia. If profound fatigue, air hunger, and night sweats continue despite appropriate Lyme treatment, Babesia is the most likely missing piece. Specific antiparasitic treatment with atovaquone and azithromycin is required.
Rage, severe anxiety, and OCD-like symptoms that persist or worsen despite Lyme treatment often suggest Bartonella co-infection driving the neuropsychiatric component. Adding rifampin-based Bartonella treatment has produced dramatic psychiatric improvement in multiple documented case series.
If a patient develops high fever, significantly low white blood cell count, and elevated liver enzymes during what appears to be Lyme disease — this is almost certainly not Lyme alone. Ehrlichia or Anaplasma co-infection should be considered. Fortunately, doxycycline (commonly used for Lyme) also covers both of these, so appropriate Lyme antibiotic treatment may already be providing coverage.
This page is a reference tool for understanding patterns — not a diagnostic instrument. The symptoms of tick-borne co-infections overlap significantly, and no symptom or combination is specific enough to confirm a diagnosis without testing. What this page can do is help you recognise patterns, articulate your experience more precisely, and have more targeted conversations with a practitioner about what to investigate. Use the links on each card to read the full profile for each infection, and see the testing guide for guidance on which laboratories offer the most sensitive testing for each pathogen.
Sources & further reading
- Cameron D — Babesia and Lyme: Co-infections overview. danielcameronmd.com
- LymeCare.org — Babesia, Bartonella & Lyme Disease Co-Infections: Symptoms & Treatment
- Aspire.care — Lyme Co-infections Overview, Dr. O'Hara
- MyLymeDoc — Lyme Disease Co-Infections Symptom Comparison Chart
- PMC3565243 — Chronic Lyme Disease and Co-infections: Differential Diagnosis
- Premier Health — Bartonella and Babesia: Hidden Coinfections in Lyme Disease
Last updated: April 2026