Immune Activation
Fever Therapy
Fever therapy harnesses the body’s most ancient immune mechanism — the febrile response. By administering bacterial lysates under controlled medical supervision, we trigger a natural fever cascade that mobilizes the immune system in ways no external heating device can replicate.
What it is
What Is Fever Therapy?
Fever therapy is the deliberate induction of a controlled, fever-like immune response using purified bacterial lysates — substances derived from inactivated bacteria that stimulate the body’s thermoregulatory center without causing infection. The principle traces back to the pioneering work of Dr. William Coley in the 1890s, who observed remarkable tumor regressions in patients who developed post-surgical fevers.
At St. George Hospital, fever therapy has been refined over decades of clinical practice. It is fundamentally different from whole-body hyperthermia: rather than heating the body externally, fever therapy activates the hypothalamus to raise core temperature through the body’s own thermoregulatory mechanisms, engaging the full immunological fever cascade — including cytokine signaling, heat shock protein production, and broad immune cell activation.
How it works
How Does It Work?
Bacterial lysates or pyrogens are administered intravenously under strict medical supervision. These substances act on the hypothalamus — the brain’s thermostat — signaling it to raise the body’s temperature set point. The body then generates fever naturally, just as it would in response to an infection.
This controlled fever activates multiple immune pathways simultaneously:
- Cytokine production: Interleukin-1, interleukin-6, tumor necrosis factor alpha, and interferons are released, coordinating a systemic immune response
- NK cell activation: Natural killer cell activity increases significantly at fever-range temperatures (39–40 degrees Celsius)
- Enhanced phagocytosis: Macrophages and neutrophils become more efficient at identifying and destroying pathogens
- Heat shock proteins: These molecular chaperones are upregulated, marking abnormal cells for immune recognition and improving antigen presentation
- Improved microcirculation: Fever increases blood flow to tissues, enhancing delivery of immune cells and supporting detoxification
- Biofilm disruption: Elevated temperatures can weaken bacterial biofilms, making persistent infections more vulnerable to immune attack and antimicrobial therapy
Who it is for
What Conditions Does It Treat?
- Chronic Lyme disease: Fever therapy helps disrupt Borrelia biofilms and activates immune responses against persistent intracellular infection
- Chronic infections: Recurrent or treatment-resistant viral and bacterial infections benefit from broad immune mobilization
- Immune suppression: Patients with weakened or dysregulated immune function may benefit from controlled immune stimulation
- Integrative oncology: As an adjunctive therapy, fever therapy may enhance immune surveillance against tumor cells and improve the efficacy of other treatments
- Chronic fatigue syndrome: Immune dysregulation is a common feature of chronic fatigue; fever therapy aims to reset and reactivate immune function
Could this belong in your plan?
That depends on your findings, not on the therapy. Send what you have with a short history; a physician reads it before the video call and tells you whether this treatment belongs in your program.
In the room
What a session feels like
- Before A dedicated treatment room, continuous medical supervision. The team checks your vital signs and contraindications, then gives the bacterial lysate intravenously at a calibrated dose.
- During Over the next 30 to 90 minutes your body raises its own temperature: chills first, then sustained warmth and sweating at 39 to 40 °C, held for one to three hours depending on your tolerance. Blankets for the chills, cool compresses for the sweating, fluids by IV.
- Afterwards The cool-down and recovery bring the whole session to four to six hours. Fatigue and mild muscle aches afterwards are normal responses of an activated immune system.
Evidence
Evidence and History
The therapeutic use of fever has a long history in medicine. In the late 19th century, Dr. William Coley, a New York surgeon, observed that cancer patients who developed post-operative infections with high fevers sometimes experienced dramatic tumor regressions. His subsequent development of “Coley’s toxins” — a mixture of killed bacteria — represented one of the first deliberate immunotherapies in medical history.
Modern research has validated many of the mechanisms underlying fever therapy. Studies have demonstrated that fever-range temperatures (39–41 degrees Celsius) significantly enhance natural killer cell cytotoxicity, improve dendritic cell maturation and antigen presentation, increase lymphocyte trafficking to lymph nodes, and upregulate heat shock proteins that serve as danger signals to the immune system.
At St. George Hospital, fever therapy has been part of the integrative treatment protocol for decades, particularly in the management of chronic Lyme disease and as an adjunct in oncology programs. The hospital’s clinical experience, combined with the growing body of published research on fever immunology, supports the therapy’s role as a valuable component of comprehensive treatment programs.
Note: Fever therapy is used as part of an individualized treatment plan and is not a standalone cure for any condition. Results vary between patients. The therapy is administered only after thorough medical evaluation and under continuous supervision.
Where we use it
Used in These Departments
Request a consultation
A video consultation in English before you travel. A physician reviews your findings first; we reply by email within one business day (Mon–Fri).
Mon–Thu 08:00–17:00, Fri 08:00–14:00 (CET/CEST)+49 8061 398-0info@clinicum-stgeorg.de
St. George Hospital is a specialist hospital, not an emergency department. In a medical emergency in Germany, dial 112.