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.
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:
Fever therapy sessions are conducted in a dedicated treatment room under continuous medical supervision. Before the session begins, the medical team reviews the patient’s vital signs, current health status, and any contraindications.
The bacterial lysate is administered intravenously at a carefully calibrated dose. Over the following 30 to 90 minutes, the body begins to generate a natural fever response. Patients typically experience an initial phase of chills and shivering as the body raises its temperature set point, followed by a plateau phase of sustained warmth and sweating.
Core body temperature is monitored continuously throughout the session. The target range is typically 39 to 40 degrees Celsius, maintained for a therapeutic window of one to three hours depending on the patient’s tolerance and treatment goals. The entire session, including the post-fever cool-down and recovery period, typically lasts four to six hours.
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.
