Malaria fever therapy for non-syphilitic psychiatric disease
01
What institutions accepted
Deliberately infecting psychiatric patients with Plasmodium vivax and provoking repeated high fevers was treated as a therapeutic method for schizophrenia, intellectual disability, affective disorders, psychopathic disorders and other conditions without neurosyphilis. At Vienna's university psychiatric clinic, fever was expected to produce a nonspecific change of psychological state or stimulate development even when there was no syphilitic infection for the heat to act against.
02
What the evidence supports now
The historical benefit of malaria fever therapy in general paresis was tied to a specific infectious cause: neurosyphilis. It did not establish P. vivax infection as a treatment for schizophrenia or other nonsyphilitic psychiatric conditions. The Vienna archival review found no detailed contemporary discussion of the indication for its four principal nonsyphilitic diagnosis groups, and the broader historical literature describes results in such disorders as mixed and less successful. Modern care treats malaria as a serious infection and neurosyphilis with antibiotics; deliberately induced malaria has no established psychiatric indication. The correction is therefore confined to the nonsyphilitic extension and does not erase the distinct pre-penicillin history of treatment for general paresis.
03
Evidence for the overall belief
Open sources, locators and notes
- SupportsHistorical beliefIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Malaria fever therapy
Documents Vienna's use of malaria fever therapy as a nonspecific “shock” treatment for schizophrenia, intellectual disability, affective and psychopathic disorders, with the intended goals of changing psychological state or stimulating development.
- SupportsPresent correctionIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Malaria fever therapy; Conclusion
Finds no detailed contemporary indication discussion for the four principal nonsyphilitic diagnosis groups and records that other psychiatric literature characterized use outside progressive paralysis as rarely effective.
- SupportsPresent correctionPsychiatric effects of malaria and anti-malarial drugs: historical and modern perspectivesMalaria Journal
Where in the source: Malariotherapy of psychiatric disease
Distinguishes the historical neurosyphilis rationale from extensions to schizophrenia and manic-depressive psychosis, whose reported results were mixed and perceived as less successful.
- SupportsPresent correctionMalaria — Fact sheetWorld Health Organization
Where in the source: Overview; Symptoms; Treatment
Defines malaria as a potentially life-threatening parasitic disease, identifies P. vivax as one of the two greatest human malaria threats and states that malaria is a serious infection requiring antimalarial treatment.
- SupportsPresent correctionNeurosyphilis, Ocular Syphilis, and Otosyphilis — STI Treatment GuidelinesU.S. Centers for Disease Control and Prevention
Where in the source: Treatment
Current neurosyphilis guidance recommends high-dose aqueous crystalline penicillin G, illustrating that even the historically distinct infectious indication is now treated without deliberately induced malaria.
- ContextualizesPresent correctionThe Nobel Prize in Physiology or Medicine 1927Nobel Prize Outreach
The official prize motivation is specifically the therapeutic value of malaria inoculation in dementia paralytica; it does not state efficacy for schizophrenia or other nonsyphilitic psychiatric disorders.
- ContextualizesPresent correctionJulius Wagner-Jauregg and the Legacy of Malarial Therapy for the Treatment of General Paresis of the InsaneYale Journal of Biology and Medicine
Where in the source: Rebirth of Biological Psychiatry; Enduring Legacy
Reviews the historically meaningful but hazardous use against general paresis before penicillin, including early remission evidence and mortality, and explains why that specific infectious indication became obsolete.
- SupportsImpactIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Background; Malaria fever therapy
Records 869 malaria-therapy cases overall, 772 in five focal adult diagnosis groups, 609 nonsyphilitic cases and the final treatment in December 1968; it also identifies 35 child-ward cases in the separate archive.
- SupportsImpactClinical and Parasitological Characteristics of Plasmodium vivax Malaria in Malaria-Naïve PatientsAmerican Journal of Tropical Medicine and Hygiene
Where in the source: Results, Study population
Identifies 869 iatrogenic P. vivax infections in the archive and 158 people whose main diagnosis was schizophrenia, while documenting inoculation doses, repeated fever peaks and subsequent antimalarial treatment.
04
Impact
Vienna's university psychiatric clinic maintained a blood-transmitted P. vivax strain and recorded 869 malaria-fever therapy cases across diagnoses from 1951 to 1968. Within five focal adult diagnosis groups, 609 of 772 treatment cases—nearly 79%—were for diagnoses other than neurosyphilis. The archive identifies 158 people whose main diagnosis was schizophrenia among those intentionally infected. Patients typically received infected blood, passed through repeated fever attacks around or above 40 °C, and were then given antimalarial drugs. The last recorded use was in December 1968, long after penicillin and psychiatric medicines had changed the available alternatives.
Context
The 772 figure counts treatment cases or admissions in the five diagnosis groups, not necessarily 772 unique people. The historical study says repeat malaria therapy was rare, so case and patient totals were close. The 869 total also includes 97 cases with other diagnoses; a separate child-ward review found 35 malaria-therapy cases.
The 1927 Nobel Prize was expressly awarded for malaria inoculation in dementia paralytica, the neuropsychiatric manifestation of late syphilis. It supplied prestige to malaria fever therapy but did not endorse its extension to schizophrenia, intellectual disability, affective disorders or psychopathic diagnoses.
Records called some transferred patients “strain carriers,” showing that they helped keep the human-to-human malaria chain alive. The investigators could not determine that any individual was infected solely for that purpose, because the same diagnoses were also treated therapeutically. The record supports concern and uncertainty, not a categorical claim of nontherapeutic experimentation.
One person in the schizophrenia cohort died during the hospital stay after P. vivax inoculation and subsequent antimalarial treatment. The file did not establish a cause of death, so this record does not attribute that death to malaria therapy.
malaria-fever therapy cases recorded across diagnoses at the Vienna clinic
cases in five focal adult diagnosis groups that involved diagnoses other than neurosyphilis
people with a main schizophrenia diagnosis identified among the iatrogenic P. vivax infections
Historical totals and effects are presented as contextual evidence, not as universal causal claims.
Institutional episode 01
Austria — Vienna
Europe
From 1951 through December 1968, Vienna's university psychiatric clinic deliberately transmitted P. vivax in a broad range of psychiatric cases. In complete schizophrenia records, inoculation was usually intravenous, the dose was 4–8 mL of infected blood and patients averaged 5.4 documented fever attacks before antimalarial treatment. The clinic described the aim outside neurosyphilis as a nonspecific change of psychological state or developmental stimulus. Yet the archival project found no detailed contemporary indication discussion for its four main nonsyphilitic diagnosis groups, and Vienna persisted after comparable German-speaking clinics had sharply reduced or ended the practice.
Institutions involved
- Psychiatric-Neurological University Clinic, Vienna
- Faculty of Medicine, University of Vienna
- Vienna General Hospital
Institutional context
Under director Hans Hoff, Vienna's university psychiatric clinic retained malaria fever therapy as an established treatment option throughout the transition to neuroleptics and antidepressants. Physicians selected patients by symptoms as well as diagnosis and used the procedure for schizophrenia, intellectual disability, affective and psychopathic disorders and other nonsyphilitic conditions. A retrospective database found 869 malaria-therapy cases overall, including 772 in five focal adult diagnosis groups; 609 of those 772 were nonsyphilitic. Most people in those diagnostic groups did not receive malaria therapy, so this was an institutionalized but selective practice rather than a universal clinic rule.
Why this persisted
Administrative adoptionThe clinic maintained a transmissible P. vivax strain, selected psychiatric inpatients for inoculation, passed infected blood from one person to the next, monitored repeated fever attacks and then administered antimalarial drugs. This clinical infrastructure made malaria fever therapy a repeatable institutional treatment outside its original neurosyphilis indication.
How correction happened
Partially corrected1968; institutional review 2012–2015 and later publication
Action: The clinic ended the practice after its last recorded treatment in December 1968. In 2012 the Medical University of Vienna commissioned an external historical investigation and presented its findings publicly in 2015; the archival findings later appeared in peer-reviewed publications.
The review documented the exceptional breadth of use, the weak published justification for nonsyphilitic indications and the possibility that strain preservation influenced individual cases. A director of a successor clinic explicitly rejected and regretted any use primarily to maintain the strain. The official presentation also judged the broader practice permissible by contemporary standards and found no evidence that it was used for punishment or testing. This is a substantive but qualified institutional reckoning; the reviewed sources do not document a categorical repudiation, apology to all affected patients or compensation program.
Consequences
- Deliberate infection of psychiatric patients with blood-stage Plasmodium vivax
- Repeated fever attacks, often around or above 40 °C, before antimalarial treatment ended the blood-stage infection
- Use for schizophrenia, intellectual disability, affective and psychopathic diagnoses without a neurosyphilis rationale
- Combination in some cases with electroshock, insulin shock or typhoid provocation therapy
- Continued exposure to an infectious disease after noninfectious psychiatric treatments and penicillin were available
- Use of some transferred patients as carriers in the chain that preserved the clinic's malaria strain
Evidence for this episode
8 evidence linksOpen sources, locators and notes
- SupportsInstitutional carrierIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Background; Malaria fever therapy
Identifies the Vienna Psychiatric-Neurological University Clinic under Hans Hoff as the treatment site and explains its unusually long continuation of malaria fever therapy from 1951 through 1968.
- SupportsMechanismIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Malaria fever therapy
Documents clinical selection, human-to-human blood transfer, preservation of a syphilis-free malaria strain and use of patients recorded as strain carriers.
- SupportsMechanismClinical and Parasitological Characteristics of Plasmodium vivax Malaria in Malaria-Naïve PatientsAmerican Journal of Tropical Medicine and Hygiene
Where in the source: Materials and Methods; Results
Reconstructs mainly intravenous inoculation with 4–8 mL of P. vivax-infected blood, a mean of 5.4 fever attacks in complete schizophrenia records and termination with quinine-based or chloroquine-based treatment.
- SupportsConsequencesIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Malaria fever therapy
Documents 609 nonsyphilitic cases among the 772 focal adult cases, use across four principal nonsyphilitic diagnosis groups, combination with other invasive therapies and the strain-carrier role.
- SupportsConsequencesClinical and Parasitological Characteristics of Plasmodium vivax Malaria in Malaria-Naïve PatientsAmerican Journal of Tropical Medicine and Hygiene
Where in the source: Results, Study population; Fever paroxysms
Provides patient-level evidence of deliberate infection, repeated temperatures around or above 40 °C, falling haemoglobin and erythrocyte measures in limited laboratory records, and one death whose cause was not established.
- ContextualizesContextThe Nobel Prize in Physiology or Medicine 1927Nobel Prize Outreach
Limits the Nobel endorsement to dementia paralytica and prevents the prize from being misread as institutional evidence for Vienna's later nonsyphilitic applications.
- DocumentsInstitutional correctionMalaria fever therapy: wide-spread administration in Vienna was an exceptional caseMedical University of Vienna
Records the Medical University-commissioned investigation, its 2015 findings, the qualified judgment that the practice was permissible by contemporary standards and a successor clinic director's rejection and regret of any use primarily to preserve the strain.
- DocumentsInstitutional correctionIn the shadow of the 'psychopharmacological revolution': Malaria fever, insulin coma, cardiazol and electroconvulsive therapy at the Vienna Psychiatric University Clinic, 1951–1969Wiener klinische Wochenschrift / Springer Nature
Where in the source: Background; Acknowledgements; Supplementary Information
Explains that Medical University leadership initiated the historical project after public allegations and provides the peer-reviewed archival account and expanded project report that followed the commission's work.
Source registryEach source is registered once and can carry several precise evidence relationships.8 sources
- 017 evidence links
- 02Clinical and Parasitological Characteristics of Plasmodium vivax Malaria in Malaria-Naïve PatientsAmerican Journal of Tropical Medicine and Hygiene3 evidence links
- 03Malaria fever therapy: wide-spread administration in Vienna was an exceptional caseMedical University of Vienna1 evidence link
- 041 evidence link
- 051 evidence link
- 062 evidence links
- 07Neurosyphilis, Ocular Syphilis, and Otosyphilis — STI Treatment GuidelinesU.S. Centers for Disease Control and Prevention1 evidence link
- 08Julius Wagner-Jauregg and the Legacy of Malarial Therapy for the Treatment of General Paresis of the InsaneYale Journal of Biology and Medicine1 evidence link