New tick records in the western Brazilian Amazon, with notes on rickettsial infection and molecular evidence for Amblyomma crassum in Brazil.
Saved in:
| Title: | New tick records in the western Brazilian Amazon, with notes on rickettsial infection and molecular evidence for Amblyomma crassum in Brazil. |
|---|---|
| Authors: | Tojal SD; Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal São João del-Rei - UFSJ, Divinópolis, MG, Brazil; Laboratório de Medicina Tropical, Universidade Federal do Acre - LABMEDT/UFAC, Rio Branco, AC, Brazil. Electronic address: sytotal@gmail.com., Labruna MB; Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo -FMVZ/USP, São Paulo, SP, Brazil., Martins TF; Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo -FMVZ/USP, São Paulo, SP, Brazil; Instituto Pasteur, Secretaria de Estado da Saúde de São Paulo, São Paulo, SP, Brazil., Meneguetti DUO; Laboratório de Medicina Tropical, Universidade Federal do Acre - LABMEDT/UFAC, Rio Branco, AC, Brazil; Programa de Pós-Graduação em Ciência, Inovação e Tecnologia para a Amazônia - CITA, Universidade Federal do Acre - UFAC, Rio Branco, AC, Brazil., Binder LC; Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo -FMVZ/USP, São Paulo, SP, Brazil., Lima J; Laboratório de Ornitologia, Universidade Federal do Acre - UFAC, Rio Branco, AC, Brazil; ICMBio - Núcleo de Gestão Integrada Alto Tarauacá - Santa Rosa do Purus, Rio Branco, AC, Brazil., Guilherme E; Laboratório de Ornitologia, Universidade Federal do Acre - UFAC, Rio Branco, AC, Brazil., Botelho ALM; Laboratório de Biodiversidade, Instituto Federal de Educação, Ciência e Tecnologia do Acre - IFAC, Campus Rio Branco, Rio Branco, AC, Brazil., da Cruz KS; Laboratório de Medicina Tropical, Universidade Federal do Acre - LABMEDT/UFAC, Rio Branco, AC, Brazil., Camargo LMA; Laboratório de Medicina Tropical, Universidade Federal do Acre - LABMEDT/UFAC, Rio Branco, AC, Brazil; Instituto de Ciências Biomédicas, Universidade de São Paulo - ICB5/USP, Monte Negro, RO, Brazil; Instituto Nacional de Epidemiologia da Amazônia Ocidental - INCT-EpiAmO, Porto Velho, RO, Brazil; Centro de Pesquisas em Medicina Tropical - CEPEM, Porto Velho, RO, Brazil. |
| Source: | Acta tropica [Acta Trop] 2025 Oct; Vol. 270, pp. 107829. Date of Electronic Publication: 2025 Sep 06. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0370374 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-6254 (Electronic) Linking ISSN: 0001706X NLM ISO Abbreviation: Acta Trop Subsets: MEDLINE |
| Imprint Name(s): | Publication: Amsterdam : Elsevier Original Publication: Basel. |
| MeSH Terms: | Rickettsia*/isolation & purification , Rickettsia*/genetics , Rickettsia*/classification , Amblyomma*/microbiology , Amblyomma*/classification , Ixodidae*/classification , Ixodidae*/microbiology, Animals ; Brazil ; Sequence Analysis, DNA ; Phylogeny ; Female ; Seasons ; RNA, Ribosomal, 16S/genetics ; Nymph/microbiology ; Molecular Sequence Data ; Male ; Tick Infestations/veterinary ; Tick Infestations/parasitology |
| Abstract: | Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. This study evaluated the richness and abundance of ticks collected during two years in forest fragments of the state of Acre, western Brazilian Amazon. Considering all the environmental and host collections, the following 15 tick species were collected: Amblyomma coelebs, Amblyomma crassum, Amblyomma humerale, Amblyomma latepunctatum, Amblyomma longirostre, Amblyomma naponense, Amblyomma nodosum, Amblyomma oblongoguttatum, Amblyomma ovale, Amblyomma pacae, Amblyomma rotundatum, Amblyomma scalpturatum, Haemaphysalis juxtakochi, Ixodes luciae and Rhipicephalus microplus. Data from the most two abundant tick species, A. oblongoguttatum and A. scalpturatum, indicated a tendency for adults of both species to be more abundant during the dry season, and the nymphs at late rainy season of each year. The findings of A. crassum consisted of six nymphs collected from an amphibian (Rhinella marina) and a mammal (Didelphis marsupialis), which were morphologically unique and whose 16S rRNA partial sequences were 100 % identity to a GenBank-16S rRNA partial sequence of A. crassum from Colombia. This is the first confirmed record of A. crassum in Brazil. A total of 155 tick specimens were molecularly tested for rickettsial infection, resulting in a 6.5 % overall infection rate. Rickettsia amblyommatis was detected in A. coelebs and A. humerale, whereas Rickettsia rhipicephali was detected in H. juxtakochi. With the present records of A. crassum and H. juxtakochi, the tick fauna of Acre increases to 26 species, which represents 48 % of the Ixodidae fauna in Brazil. This is undoubtedly an extraordinary representation, considering that the state of Acre represents <2 % of the Brazilian territory. (Copyright © 2025. Published by Elsevier B.V.) |
| Contributed Indexing: | Keywords: Acre; Ixodidae; Rainforest; Rickettsia amblyommatis; Rickettsia rhipicephali |
| Substance Nomenclature: | 0 (RNA, Ribosomal, 16S) |
| Entry Date(s): | Date Created: 20250908 Date Completed: 20250919 Latest Revision: 20250919 |
| Update Code: | 20250920 |
| DOI: | 10.1016/j.actatropica.2025.107829 |
| PMID: | 40921344 |
| Database: | MEDLINE |
Full Text Finder 
Nájsť tento článok vo Web of Science | Abstract: | Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br />This study evaluated the richness and abundance of ticks collected during two years in forest fragments of the state of Acre, western Brazilian Amazon. Considering all the environmental and host collections, the following 15 tick species were collected: Amblyomma coelebs, Amblyomma crassum, Amblyomma humerale, Amblyomma latepunctatum, Amblyomma longirostre, Amblyomma naponense, Amblyomma nodosum, Amblyomma oblongoguttatum, Amblyomma ovale, Amblyomma pacae, Amblyomma rotundatum, Amblyomma scalpturatum, Haemaphysalis juxtakochi, Ixodes luciae and Rhipicephalus microplus. Data from the most two abundant tick species, A. oblongoguttatum and A. scalpturatum, indicated a tendency for adults of both species to be more abundant during the dry season, and the nymphs at late rainy season of each year. The findings of A. crassum consisted of six nymphs collected from an amphibian (Rhinella marina) and a mammal (Didelphis marsupialis), which were morphologically unique and whose 16S rRNA partial sequences were 100 % identity to a GenBank-16S rRNA partial sequence of A. crassum from Colombia. This is the first confirmed record of A. crassum in Brazil. A total of 155 tick specimens were molecularly tested for rickettsial infection, resulting in a 6.5 % overall infection rate. Rickettsia amblyommatis was detected in A. coelebs and A. humerale, whereas Rickettsia rhipicephali was detected in H. juxtakochi. With the present records of A. crassum and H. juxtakochi, the tick fauna of Acre increases to 26 species, which represents 48 % of the Ixodidae fauna in Brazil. This is undoubtedly an extraordinary representation, considering that the state of Acre represents <2 % of the Brazilian territory.<br /> (Copyright © 2025. Published by Elsevier B.V.) |
|---|---|
| ISSN: | 1873-6254 |
| DOI: | 10.1016/j.actatropica.2025.107829 |