Isolation and molecular characterization of West Nile Virus with evidence of vertical transmission in the Coastal region, Kenya.
Microbiology spectrum·
- DOI
- 10.1128/spectrum.04205-25
- PMID
- 42640093
- PMCID
- —
- OpenAlex
- —
- Study type
- Genomic study
- Publisher
- Publisher unavailable
- Article type
- journal-article
- Integrity
- current
Why this research matters now
The findings provide genomic and vector-associated information about West Nile virus detected in the sampled Kenyan settings, including two reported viral lineages and a reported vertical-transmission event. The authors identify continued genomic surveillance, vector competence research, and integrated arbovirus monitoring as relevant areas for prevention and control planning.
Structured evidence summary
Research question
The study examined which West Nile virus lineages and genetic features were present in mosquito populations sampled across four Kenyan counties, including the coastal region, and investigated evidence of vertical transmission.
Study design
This was a mosquito-based arboviral surveillance and genomic characterization study. The researchers collected and pooled mosquitoes, cultured pool material, sequenced viral RNA, performed genome and phylogenetic analyses, and assessed codon-level selection; the supplied abstract also describes lineage-specific replication assays in cell lines.
Population and setting
The study analyzed 14,105 mosquitoes collected with CDC miniature light traps from Kwale, Kilifi, Mombasa, and Isiolo counties in Kenya. The mosquitoes were grouped into 1,596 pools by species and location.
Main findings
West Nile virus was detected in ten mosquito pools, comprising eight Lineage 1a detections and two Lineage 2 detections. Isolates were associated with five mosquito species, and one Lineage 1a isolate from a male Aedes aegypti was reported as evidence of vertical transmission. The analysis also identified six codons under diversifying selection and a V103A mutation in NS2B.
Public-health relevance
The findings provide genomic and vector-associated information about West Nile virus detected in the sampled Kenyan settings, including two reported viral lineages and a reported vertical-transmission event. The authors identify continued genomic surveillance, vector competence research, and integrated arbovirus monitoring as relevant areas for prevention and control planning.
Important limitations
The evidence is based on mosquito sampling, laboratory isolation, sequencing, and analyses described in the supplied abstract; it does not establish human disease burden or clinical outcomes. The summary is limited to the supplied single-article abstract and metadata, and the original paper is required for decision-grade interpretation of sampling coverage, assay performance, and study limitations.
GIDS interpretation
This article is discoverable as a Kenya-focused West Nile virus genomic epidemiology and surveillance study involving vector-associated transmission findings. It provides contextual evidence from one reported study and should not be treated as confirmation of a current surveillance signal.
Related GIDS surveillance
Literature context does not validate, explain, or change a surveillance signal. Exact and contextual relationships are shown separately.
Evidence relationships
This article has 8 auditable classifier relationships to diseases, places, topics, and study design.