Beyond Borrelia: Babesia, Bartonella, and Other Coinfections
7 min read
When a tick bites, it can deliver more than Borrelia. Ticks are living reservoirs that often carry several pathogens at once, and a single bite can transmit multiple infections simultaneously. These coinfections are one of the biggest reasons people treated for "just Lyme" don't fully recover — the treatment addressed one organism while others kept the illness going.
Why coinfections change everything
Coinfections matter for three practical reasons:
- They shift the symptom picture. Drenching night sweats, air hunger, or unusual neurological symptoms may point to a specific coinfection rather than Borrelia.
- They respond to different treatments. Antibiotics that work against Lyme may do nothing for a parasite like Babesia.
- They're frequently missed. If no one tests for them, they stay invisible — and the patient stays sick.
The common coinfections
Babesia
A malaria-like parasite that infects red blood cells. Hallmark clues include:
- Drenching night sweats and unexplained chills
- "Air hunger" — feeling short of breath with normal lungs
- Severe fatigue and headaches
Because it's a parasite, Babesia requires anti-parasitic treatment, not standard Lyme antibiotics.
Bartonella
A bacterial infection associated with:
- Distinctive skin markings resembling stretch marks (often reddish or purple)
- Pain on the soles of the feet, especially in the morning
- Neuropsychiatric symptoms — anxiety, irritability, rage, and mood swings
- Swollen glands and sore throats
Bartonella's neuropsychiatric footprint is significant and frequently mistaken for a primary psychiatric disorder.
Anaplasma and Ehrlichia
Related bacterial infections that can cause:
- High fever, chills, and severe headache
- Muscle aches
- Low white blood cell and platelet counts (a lab clue)
These can become serious quickly and are often more responsive to prompt antibiotic treatment.
Mycoplasma
A tiny bacterium linked to fatigue, joint pain, and respiratory symptoms, frequently found alongside chronic Lyme.
Others
Depending on region and tick species, Powassan virus, Tularemia, Rocky Mountain spotted fever, and Borrelia miyamotoi may also be relevant.
How coinfections are evaluated
Because testing has the same limitations as Lyme testing — antibody-based, imperfect sensitivity — Lyme-literate clinicians weigh clinical patterns heavily:
- Night sweats and air hunger raise suspicion for Babesia
- Foot pain, skin striae, and neuropsychiatric symptoms raise suspicion for Bartonella
- Sudden high fever with abnormal blood counts raises suspicion for Anaplasma/Ehrlichia
If you were treated for Lyme and improved only partially — or improved and then plateaued — an unaddressed coinfection is one of the first things a knowledgeable clinician will consider.
What to do next
- Note sweats, air hunger, foot pain, and mood changes in our symptom checker so your report captures coinfection clues.
- Read about the MSIDS model, which places coinfections in the larger chronic-illness picture.
- Find a Lyme-literate certified provider who evaluates and treats coinfections, not just Lyme.