ArticlePLoS neglected tropical diseases2026
Xenopsylla buxtoni fleas as a dominant species harboring multiple infections of Wolbachia lineages in the ancient plague epicenters of Iran.
Article in PLoS neglected tropical diseases, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Fleas are permissive and euryxenous ectoparasites capable of transmitting numerous ancient and new pathogens among warm-blooded animals, including humans. Precise identification of flea species involved in disease transmission and understanding the highly specialized morphological characteristics associated with their ectoparasitic lifestyle is essential. Likewise, identifying endosymbionts such as Wolbachia-which have long-lasting and intimate relationships with their hosts-will enhance our knowledge of the epidemiology of flea-borne diseases and their control. Flea sampling was conducted in the western half of Iran, where the highest plague outbreaks have been reported over the past two centuries. A total of 1,439 fleas, comprising 623 males and 816 females, were detached from 223 hosts and were identified as Xenopsylla buxtoni, X. nuttalli, X. astia, Pulex irritans, Nosopsyllus iranus iranus, and Ctenophthalmus rettigi smiti. Also, 116 and 73 nucleotide sequences were analyzed to assess the genetic diversity and phylogenetic position of the fleas, and to determine their infection rate and Wolbachia supergroup. Molecular analysis of the COII and ITS2 genes confirmed the morphological distinctiveness of the six species. Xenopsylla buxtoni, the most abundant taxon, displayed Wolbachia infection rates of 62%-75% (x̄ = 69%). The Wolbachia sequences identified from the fleas were assigned to supergroups A, F, and B. The taxonomic position of X. buxtoni and its closely related species, X. nuttalli, in the conformis group was questioned due to significant genetic divergence. The impact of Wolbachia on flea ecology and its potential impact in controlling flea populations and flea-borne pathogens was highlighted.
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