Emergence of Two New Lineages of the Cosmopolitan Dengue Virus Serotype 2 in Yunnan, China, 2024
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By
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Man Li
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Fen Zeng
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Wei Chang
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Mengyuan Zheng
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Xiaojuan Chen
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Ziying Wu
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Li Liu
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Xueshan Xia
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Yue Feng
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August 11, 2025
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Clinical Scorecard: Identification of Two Novel Lineages of Dengue Virus Serotype 2 in Yunnan, China, 2024
At a Glance
| Category | Detail |
|---|
| Condition | Dengue fever caused by dengue virus serotype 2 (DENV-2) |
| Key Mechanisms | Mosquito-borne viral infection transmitted primarily by Aedes mosquitoes; genetic diversity with two novel DENV-2 lineages identified |
| Target Population | Residents and travelers in Yunnan Province, China, especially in Xishuangbanna region |
| Care Setting | Hospital and laboratory settings for diagnosis and molecular epidemiological surveillance |
Key Highlights
- Two novel lineages of cosmopolitan DENV-2 identified in Yunnan, originating from Thailand and Cambodia.
- DENV infection detected in 101 of 321 suspected cases; majority were DENV-2 cosmopolitan genotype.
- Xishuangbanna region shows diverse and complex DENV-2 genotypes with ongoing outbreaks since 2013.
Guideline-Based Recommendations
Diagnosis
- Screen suspected dengue cases using DENV NS1 antigen rapid test and Pan-DENV qPCR for confirmation.
- Perform serotype-specific RT-qPCR assays for dengue virus serotyping.
- Use RT-nested PCR and sequencing for genotype identification and molecular epidemiology.
Management
- No approved antiviral drugs or widely available vaccines; focus on supportive care and symptom management.
- Implement vector control measures to reduce Aedes mosquito populations and prevent transmission.
Monitoring & Follow-up
- Conduct molecular surveillance and phylogenetic analysis to track dengue virus genotypes and transmission sources.
- Monitor epidemiological trends in endemic regions and border areas with high human mobility.
Risks
- High risk of dengue outbreaks in tropical and subtropical climates with abundant Aedes mosquitoes.
- Cross-border transmission due to proximity to endemic countries (Thailand, Cambodia, Laos, Myanmar).
- Climate change, urbanization, and population growth increase dengue transmission risk.
Patient & Prescribing Data
Patients with suspected acute dengue infection presenting within first 5 days of illness in Yunnan Province
Diagnosis relies on antigen and molecular testing; no specific antiviral treatment available; management is supportive.
Clinical Best Practices
- Early detection using combined NS1 antigen and qPCR testing improves diagnostic accuracy.
- Genotyping and phylogenetic analysis aid in understanding transmission dynamics and outbreak sources.
- Vector control and public health interventions remain critical to prevent dengue spread in endemic border regions.
References
