ArticleTicks and tick-borne diseases2022
Genetic characterization of a novel Ehrlichia chaffeensis genotype from an Amblyomma tenellum tick from South Texas, USA.
Article in Ticks and tick-borne diseases, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 7 citations in OpenAlex.
- Review
- Molecular detection of Ehrlichia chaffeensis in marsh deer (Blastocerus dichotomus) and their parasitic Amblyomma triste ticks in Argentina suggests a local transmission cycle.Parasites & vectors · 2026Article
- Bird-tick and human-tick encounters in the Rio Grande Valley (Texas, USA): ecological associations and pathogen detections.Parasites & vectors · 2025Article
- Proceedings from the Fourth Mesoamerican Symposium "Dr. Roberto Navarro López" on Emerging Zoonotic Disease and Arboviruses: Commenting Insights and Research Findings.Research and reports in tropical medicine · 2025Article
- Triangulating the New Frontier of Health Geo-Data: Assessing Tick-Borne Disease Risk as an Occupational Hazard among Vulnerable Populations.International journal of environmental research and public health · 2022Article
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Authors and funding
5 authors at 1 institution in 1 country.
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Abstract
Ehrlichia chaffeensis is the causative agent of human monocytotropic ehrlichiosis (HME), a disease that ranges in severity from mild to fatal infection. Ehrlichia chaffeensis is maintained in a zoonotic cycle involving white-tailed deer (Odocoileus virginianus) as the main vertebrate reservoir and lone star ticks (Amblyomma americanum) as its principal vector. Through complete genomic analysis from human ehrlichial isolates and DNA sequences obtained from deer and tick specimens, nine strains of E. chaffeensis have been characterized. Few studies have examined the genetic diversity of E. chaffeensis in ticks, and some of these investigations have identified that the genetic sequences coincide with the circulating strains reported so far. Here, we report the first evidence of E. chaffeensis DNA from an unfed Amblyomma tenellum (formerly Amblyomma imitator) collected in South Texas. We characterized the genetic variation of this E. chaffeensis genotype using conserved gene markers such as rRNA, dsb, and groEL. We also used gene targets useful to distinguish genotypes, such as the variable length PCR target gene (VLPT) and 120-kDa gene, encoding the tandem-repeat proteins TRP32 and TRP120, respectively. Our results suggest a novel E. chaffeensis genotype that exhibited greater variability than other genotypes of E. chaffeensis and highlights the role for A. tenellum as a potential vector of E. chaffeensis.
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