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The primary objective of this study is to quantify the clinical burden of Japanese Encephalitis (JE) and the asymptomatic circulation of JEV among Cambodian children, through two pediatric cohorts: non-febrile children at recruitment and children hospitalized with febrile neurological syndrome (FNS). Secondary objectives include estimating anti-JEV seropositivity rates, identifying individual risk factors and living conditions associated with JEV infection, characterizing clinical and biological profiles related to disease severity, and evaluating the role of deficiencies in interferon (IFN) response in severe JEV infections.
This is an observational prospective study (with cross-sectional and longitudinal designs) involving two pediatric cohorts recruited from Kantha Bopha hospitals in Phnom Penh and Siem Reap. Group 1 will consist of 2000 non-febrile children aged 2-14 years, recruited from trauma units and followed up for two years to monitor JEV seroconversion. Group 2 will include 2000 children hospitalized with FNS, confirmed JE participants will be followed up for one year to assess the severity of JEV infection. Diagnostic tools such as the QIAstat molecular diagnostic platform and ELISA will be used to detect multiple pathogens, including JEV and dengue virus (DENV). Data collection will involve clinical assessments, etiological testing, and environmental surveys. All collected information will be integrated into a centralized database for analysis.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| DEMELE-JEV Cohort 1 | This group will include children aged 2-14 years who present at the hospital for reasons other than infectious disease suspicion. During the study of the project, 2000 children will be recruited at each study site. All these children will be followed up at one year and two years post-inclusion | ||
| DEMELE-JEV Cohort 2 | This group will include children aged 2-14 years who are hospitalized with febrile neurological syndrome (FNS) |
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| Measure | Description | Time Frame |
|---|---|---|
| To quantify Japanese Encephalitis Virus seroconversion in a cohort of asymptomatic children aged 2-14 years | Japanese Encephalitis Virus seroconversion will be determined based on PCR positivity or ELISA results, with confirmatory testing by virus neutralization assays. Unit of Measure: Binary measure (presence or absence) of JEV antibodies or presence of JEV RNA | 24 months |
| Measure | Description | Time Frame |
|---|---|---|
| To assess factors related to the clinical severity of JEV infection among children hospitalized with febrile neurological symptoms (FNS) who are confirmed JEV cases. | Severity will be evaluated based on the following clinical indicators:
|
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Inclusion Criteria:
Cohort 1
Cohort 2
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see eligibility
| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Diana Molino, PhD | Contact | +33 1 53 94 60 76 | diana.molino@inserm.fr |
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Cambdodia local reglementation will decide de IPD
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| ID | Term |
|---|---|
| D004672 | Encephalitis, Japanese |
| ID | Term |
|---|---|
| D004671 | Encephalitis, Arbovirus |
| D018792 | Encephalitis, Viral |
| D020805 | Central Nervous System Viral Diseases |
| D002494 | Central Nervous System Infections |
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blood samples and cerebrospinal fluid
| 12 months |
| D007239 | Infections |
| D000069544 | Infectious Encephalitis |
| D001102 | Arbovirus Infections |
| D000079426 | Vector Borne Diseases |
| D000096724 | Mosquito-Borne Diseases |
| D014777 | Virus Diseases |
| D012327 | RNA Virus Infections |
| D018177 | Flavivirus Infections |
| D018178 | Flaviviridae Infections |
| D004660 | Encephalitis |
| D001927 | Brain Diseases |
| D002493 | Central Nervous System Diseases |
| D009422 | Nervous System Diseases |
| D000090862 | Neuroinflammatory Diseases |