Quick answer: Roughly 10 to 20 percent of people treated for Lyme disease still have symptoms months later, and a 2022 Johns Hopkins study found 14 percent stayed sick even after early, textbook treatment. The usual causes are a missed co-infection like Babesia or Bartonella, bacteria that tolerate standard antibiotics, or lasting immune effects after the infection. The next step is a careful reassessment, not another identical round of the same drug.
Finishing your antibiotics is not the same as finishing treatment.
The two-to-four week course of doxycycline most doctors prescribe was built for early Lyme, caught within days of a tick bite. It was not built for what Lyme becomes after months or years in the body. By then the infection behaves differently. It can involve bacteria that tolerate standard antibiotics. It can involve an immune system knocked off balance. And it can involve co-infections your first test never looked for. Completing the protocol is not proof the infection is gone. For many people who are still sick after Lyme antibiotics, that gap is exactly where a careful reassessment begins.
Roughly 10 to 20 percent of people treated for Lyme still have symptoms months later. The best study to date puts it at 14 percent, even after fast, textbook care. In 2022, the Johns Hopkins Lyme Disease Research Center followed patients who were diagnosed early and treated promptly. Fourteen percent still had lasting, function-limiting symptoms six months later. Only 4 percent of people who never had Lyme did. These were not late or mistreated cases. They got the care the guidelines recommend. One in seven stayed sick anyway.
Two findings matter if you are a woman who has been brushed off. Women were four times as likely as men to stay sick rather than fully recover. And the authors were clear that 14 percent likely undercounts real life. Their patients were caught early. Most people are not. If you were diagnosed late, or bounced between doctors first, your odds of lingering symptoms run higher, not lower.
None of this is a fringe idea. It is an active, NIH-funded area of research, described in the medical literature for years.
Doxycycline mostly stops Lyme bacteria from multiplying. It does not kill them outright. It leans on your immune system to finish the job, and that partnership does not always hold. In early Lyme caught quickly, it usually works well. When the infection is more advanced, or your immune response is not clearing it, the result gets less predictable. That is why some people recover fully, some partly, and some not at all on the same prescription. It is also why repeating that prescription often gives the same incomplete result.
There is a biological reason the same drug can keep falling short. In the lab, Borrelia burgdorferi can shift into slow-growing, dormant forms, sometimes called persister cells. It can also form clustered, biofilm-like colonies. Studies show these forms tolerate the standard Lyme antibiotics far better than active, growing bacteria do. This is lab and animal evidence, not proof of what is happening in any one patient, and it is still an open question. But it is a plausible reason a drug that works on paper can leave some people sick. And it is a reason the answer is rarely just another identical round. In our practice, biofilm and persistent bacterial forms are part of what we assess when someone has not responded to standard treatment. When we address them as part of a fuller, individualized plan, we regularly see patients regain ground they could not on repeat antibiotic courses alone.
A standard Lyme antibiotic targets Lyme, and nothing else. The same tick can carry more than one pathogen. A person can have another infection alongside Lyme, or instead of it, and see no improvement on doxycycline no matter how many rounds they finish. In a large survey of chronic Lyme patients by LymeDisease.org, more than half reported at least one lab-confirmed co-infection. Thirty percent reported two or more. Co-infections are not a rare footnote. For many people who stay sick, an untreated co-infection is what standard treatment left behind.
Babesia is a malaria-like parasite, not a bacterium. Lyme antibiotics do not touch it. It needs antiparasitic medication. It was the most common co-infection in that survey, at 32 percent, and it tends to bring night sweats, air hunger, and deep fatigue.
Bartonella can drive fatigue, cognitive changes, and neurological symptoms that overlap almost exactly with persistent Lyme. Standard Lyme treatment does not address it. It was reported by 28 percent. One thing to know: unlike Babesia, Bartonella is not established as tick-transmitted in the same way. It is better understood as a separate infection a person may also carry, not a guaranteed passenger on a Lyme tick.
Ehrlichia and Anaplasma affect white blood cells and need their own targeted testing. Neither shows up on a standard Lyme panel.
Not everyone with lingering symptoms has a co-infection. But the DMV is a high-burden region for several tick-borne illnesses. Here, checking for one is a reasonable part of any thorough reassessment.
Remaining symptomatic after antibiotics does not point to one single cause. That is exactly why the next step is evaluation, not assumption. It may mean the infection was treated but recovery is slow, which is common and real. It may mean a co-infection was missed. It may mean the symptoms now reflect lasting effects of the infection, like immune or nervous-system changes, rather than active bacteria. Or it may mean a different diagnosis deserves a look alongside Lyme. Each one points to a different next move. The goal is to find out which one you are dealing with.
Here is what it does not mean. It does not mean you are imagining your symptoms. It does not mean nothing more can be done. And it does not mean more of the same antibiotic is your only option. Repeating long antibiotic courses is not a cure-all, and it carries real risks of its own. That is one more reason a careful, individualized reassessment beats running the same protocol again.
If you have finished one or more rounds of Lyme antibiotics and still feel unwell, these questions can open a more useful conversation.
These are starting points for a real discussion, not a substitute for individual medical advice.
Shenandoah National Park. Rock Creek Park. The trails across Loudoun County. The same mid-Atlantic parks and trails that draw people outdoors are also some of the highest tick-burden terrain in the country. DC, Maryland, and Virginia rank among the higher-exposure areas for Lyme. And most people who are exposed never remember a bite. The tick that transmits Lyme is often a nymph the size of a poppy seed. A weak or incomplete response to treatment in a high-exposure area is a reason to widen the workup, not to end it.
For why standard Lyme testing misses infections in this region, see our companion post on what a negative Lyme test can miss.
Still sick after Lyme antibiotics is a real, recognized problem. It deserves a clinical answer, not dismissal and not another identical prescription. The most grounded next step is a careful reassessment. Review the full picture. Check whether co-infections or other drivers were missed. Ask whether a different approach fits your case. That conversation is worth having with a provider who has the experience to see what a standard workup can miss.
Still looking for answers after standard Lyme treatment? Indigo Integrative Health Clinic is based in Washington, DC and works with patients across the DMV who have not gotten better on the standard protocol. Our evaluation is individualized: co-infection assessment, a thorough review of your history, and care built around your specific picture rather than a one-size-fits-all course. A complimentary Discovery Call is where every Indigo patient starts. It is a 20-minute phone call, and a team member walks through your symptom history, your past testing, and what you have already tried. You come away with a clear read on whether your case is one we can help with, and what a fuller workup would look for. No cost, no commitment, just a straight answer on whether this is worth pursuing. Book a free Discovery Call →
This content is provided by Indigo Integrative Health Clinic for educational purposes only. It does not constitute medical advice, a diagnosis, or a treatment recommendation, and does not establish a provider-patient relationship. Individual health conditions vary — information presented here may not apply to your specific situation. Always consult a qualified, licensed healthcare provider before making decisions about your health, medications, supplements, or treatment plan.
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