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Tick-borne encephalitis is caused by an arbovirus of the Flaviviridae family (tick-borne encephalitis virus, TBEV), transmitted principally by the bite of the Ixodes ricinus tick. The symptomology is biphasic, with the initial phase being associated with a flu-like illness and the second phase (occurring in less than 10% of patients) with symptoms of meningitis or, more rarely, meningoencephalitis.
Features include very common findings: CSF pleocytosis; and common findings: Low white blood cell count (decreased total leukocyte count), Nausea, Anorexia, and Headache and others. 63 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 18 | Headache, Fatigue, Atypical behavior |
Phenotype severity distribution: 1 very common feature, 9 common features.
Estimated prevalence: Unknown (Unknown prevalence).
6 clinical trials registered, 3 recruiting. Interventions under study include other interventions and drug therapy. Pipeline includes 1 PHASE3, 1 PHASE1, 1 NA. Research is primarily sponsored by academic and government institutions.
NCT ID | Title | Phase | Sponsor | Status |
|---|---|---|---|---|
[NCT07377253](https://clinicaltrials.gov/study/NCT07377253) |
Data assembled from 5 of 12 sources · Last updated Sep 20, 2026, 12:11 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Digestive system
5 |
Nausea, Anorexia, Vomiting |
Muscles | 4 | Myalgia, Tongue fasciculations, Skeletal muscle atrophy |
Ears | 4 | Tinnitus, Hearing loss (hearing impairment), Vertigo |
Blood and immune system | 3 | Low white blood cell count (decreased total leukocyte count), Low platelet count (thrombocytopenia), Elevated white blood cell count (increased total leukocyte count) |
Lab test results | 3 | Increased circulating IgG concentration, Elevated CRP (inflammation marker) (elevated circulating c-reactive protein concentration), Elevated circulating hepatic transaminase concentration |
Bones and joints | 2 | Arthralgia, Skeletal muscle atrophy |
Eyes | 1 | Visual impairment |
Arms and legs | 1 | Limb pain |
Heart and blood vessels | 1 | Abnormal heart muscle (abnormal myocardium morphology) |
Head and neck | 1 | Facial palsy |
Lungs and breathing | 1 | Fatigable weakness of respiratory muscles |
First-in-Human Study Testing a New Antibody Treatment for Tick-Borne Encephalitis in Healthy Volunteers.
PHASE1 |
Giuseppe Pantaleo |
NOT_YET_RECRUITING |
[NCT07358910](https://clinicaltrials.gov/study/NCT07358910) | Risk Assessment of Community Spread of Multiple Endemic Infectious Diseases in a One Health Perspective | — | Institut Pasteur du Cambodge | RECRUITING |
[NCT07191223](https://clinicaltrials.gov/study/NCT07191223) | Evaluation of Knowledge on Tick-borne Encephalitis Virus (TBEV) Infection Among General Practitioners in France | — | University Hospital, Strasbourg, France | RECRUITING |
[NCT06859619](https://clinicaltrials.gov/study/NCT06859619) | Serological Measurement of Montpellier Professionals' Contacts with Infectious Agents Responsible for Animal-borne Diseases | NA | University Hospital, Montpellier | NOT_YET_RECRUITING |
[NCT05138055](https://clinicaltrials.gov/study/NCT05138055) | The NOrwegian Tick-borne Encephalitis Study | — | Sykehuset Telemark | ACTIVE_NOT_RECRUITING |
5 publications have been identified in PubMed for tick-borne encephalitis. Research spans Basic Science / Preclinical (60%), Clinical Trial Publication (20%), and Epidemiology / Natural History (20%).
Everson KA (2026). [PMID: 41991424](https://pubmed.ncbi.nlm.nih.gov/41991424/). *Dis Mon*. [Clinical Trial Publication]
D'Addiego J (2025). [PMID: 39708995](https://pubmed.ncbi.nlm.nih.gov/39708995/). *Virus Res*. [Epidemiology / Natural History]
Bartíková P (2025). [PMID: 40512306](https://pubmed.ncbi.nlm.nih.gov/40512306/). *Methods Mol Biol*. [Basic Science / Preclinical]
Pichkur EB (2024). [PMID: 38465849](https://pubmed.ncbi.nlm.nih.gov/38465849/). *Emerg Microbes Infect*. [Basic Science / Preclinical]
Moiseenko A (2024). [PMID: 38073510](https://pubmed.ncbi.nlm.nih.gov/38073510/). *Emerg Microbes Infect*. [Basic Science / Preclinical]
AI-curated news mentioning tick-borne encephalitis
Updated Aug 13, 2026
A study published in PubMed reveals serological evidence of Tick-Borne Encephalitis Virus (TBEV) exposure among hospitalized neurological patients in Israel from 2010 to 2019. This research highlights the potential impact of TBEV on neurological health, warranting further investigation.
A rare case of myocarditis associated with tick-borne encephalitis virus (TBEV) has been documented, highlighting extraneurological manifestations of the virus. The study includes a systematic literature review, providing insights into the clinical implications of TBEV beyond neurological symptoms.
A rare case study highlights breakthrough tick-borne encephalitis in an adolescent who received four doses of the TBE vaccine. This finding raises questions about vaccine efficacy and the need for further research in this area.