Rickettsia infection in Amblyomma tonelliae, a tick species from the Amblyomma cajennense complex

Tarragona, Evelina Luisa; Cicuttin, Gabriel L.; Mangold, Atilio José; Mastropaolo, Mariano; Salvo, María N. De; Nava, Stefano

doi:10.1016/j.ttbdis.2014.11.010

Cited by 21 publications

(14 citation statements)

References 43 publications

(44 reference statements)

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“…The only work in which the natural infection of A. tonelliae ticks with Rickettsia spp. has been evaluated is that of Tarragona et al (2015a), in which no ticks were found to be infected with R. rickettsii. However, given that levels of R. rickettsii infection previously reported in natural populations of A. cajennense s.l.…”

Section: Discussionmentioning

confidence: 99%

“…However, given that levels of R. rickettsii infection previously reported in natural populations of A. cajennense s.l. were low (around 1%) or non-existent (Guedes et al, 2005;Sangioni et al, 2005;Labruna, 2009), it is important to take into consideration the fact that Tarragona et al (2015a) evaluated only 68 ticks for Rickettsia infection. Therefore, further studies are required to determine prevalences of R. rickettsii infection in natural populations of A. tonelliae along the zone of distribution of this species in the Southern Cone of America.…”

Section: Discussionmentioning

confidence: 99%

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Vectorial competence of Amblyomma tonelliae to transmit Rickettsia rickettsii

Tarragona

Soares

Costa

et al. 2016

Medical Vet Entomology

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The aim of this work was to test the vectorial competence of Amblyomma tonelliae (Ixodida: Ixodidae) to transmit Rickettsia rickettsii (Rickettsiales: Rickettsiaceae), the agent of Rocky Mountain spotted fever (RMSF). All parasitic stages of A. tonelliae were exposed to R. rickettsii by allowing each stage to feed on hosts inoculated with this pathogen. Thereafter, ticks were fed on uninfected hosts. All stages of A. tonelliae were able to acquire the R. rickettsii infection and maintain it by transstadial and transovarial transmission. When infected ticks fed on uninfected hosts, the hosts developed rickettsiosis disease. This study demonstrates the vectorial competence of A. tonelliae to transmit R. rickettsii. These results have epidemiological relevance because A. tonelliae is one of the tick species most likely to infest humans in Argentina, including in areas in which RMSF has been reported.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Vectorial competence of Amblyomma tonelliae to transmit Rickettsia rickettsii

Tarragona

Soares

Costa

et al. 2016

Medical Vet Entomology

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“…Further, specimens of A. tonelliae were recently found to be infected with 'Candidatus Rickettsia amblyommii' and Rickettsia sp. strain El Tunal in northwestern Argentina (Tarragona et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ecology and genetic variation of Amblyomma tonelliae in Argentina

Tarragona

Mangold

Mastropaolo

et al. 2015

Medical Vet Entomology

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The ecology of Amblyomma tonelliae (Ixodida: Ixodidae), including its seasonal distribution and the development periods of each stage, was investigated during a study carried out over two consecutive years in northwestern Argentina. In addition, the genetic variation of this tick was studied through analyses of 16S rDNA sequences. Amblyomma tonelliae has a 1-year lifecycle characterized by a long pre-moult period in larvae with no development of morphogenetic diapause. Larvae peak in abundance during late autumn and early winter; nymphs peak in abundance in spring, and adults do so from late spring to early summer. Amblyomma tonelliae shows a marked ecological preference for the driest areas of the Chaco ecoregion. In analyses of 16S rDNA sequences in genes from different populations of A. tonelliae, values for nucleotide diversity and the average number of nucleotide differences showed genetic diversity within this species to be low. No significant differences were found in comparisons among populations.

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“…strain El Tunal, and Rickettsia sp. endosymbiont of Amblyomma parvitarsum PACHECO et al, 2007;SARACHO BOTTERO et al, 2015;TARRAGONA et al, 2015;OGRZEWALSKA et al, 2016).…”

mentioning

confidence: 99%

Rickettsial infection in ticks infesting wild birds from two eco-regions of Argentina

Flores

Costa

Nava

et al. 2016

Rev. Bras. Parasitol. Vet.

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Several tick-borne Rickettsia species are recognized human pathogens in Argentina. Here we evaluated rickettsial infection in ticks collected on passerine birds during 2011-2012 in two eco-regions of Argentina. The ticks were processed by molecular analysis through polymerase chain reaction (PCR) detection and DNA sequencing of fragments of two rickettsial genes, gltA and ompA. A total of 594 tick specimens (532 larvae and 62 nymphs), representing at least 4 species (Amblyomma tigrinum, Ixodes pararicinus, Haemaphysalis juxtakochi, Haemaphysalis leporispalustris), were evaluated. At least one A. tigrinum larva, collected on Coryphospingus cucullatus in Chaco Seco, was infected with Rickettsia parkeri, whereas at least 12 larvae and 1 nymph of I. pararicinus, collected from Troglodytes aedon, Turdus amaurochalinus, Turdus rufiventris, C. cucullatus and Zonotrichia capensis, were infected with an undescribed Rickettsia agent, genetically related to several rickettsial endosymbionts of ticks of the Ixodes ricinus complex. R. parkeri is a recognized human pathogen in several American countries including Argentina, where a recent study incriminated A. tigrinum as the potential vector of R. parkeri to humans. Birds could play an important role in dispersing R. parkeri-infected A. tigrinum ticks. Additionally, we report for the first time a rickettsial agent infecting I. pararicinus ticks.Keywords: Rickettsia parkeri, endosymbiont, Amblyomma tigrinum, Ixodes pararicinus, passeriformes. ResumoAlgumas espécies de Rickettsia transmitidas por carrapatos são reconhecidos como patógenos humanos na Argentina. Este presente trabalho avaliou a infecção por Rickettsia em carrapatos coletados em aves passeriformes, durante 2011-2012, em duas ecorregiões da Argentina. Os carrapatos foram processados pela reação em cadeia da polimerase (PCR) e sequenciamento de DNA de dois genes de Rickettsia: gltA e ompA. Ao todo, 594 amostras de carrapatos (532 larvas e 62 ninfas), representando pelo menos 4 espécies (Amblyomma tigrinum, Ixodes pararicinus, Haemaphysalis juxtakochi, Haemaphysalis leporispalustris), foram avaliadas. Pelo menos uma larva de A. tigrinum, coletada de Coryphospingus cucullatus no Chaco Seco, estava infectada com Rickettsia parkeri, enquanto pelo menos 12 larvas e 1 ninfa de I. pararicinus, coletadas de Troglodytes aedon, Turdus amaurochalinus, Turdus rufiventris, C. cucullatus e Zonotrichia capensis estavam infectadas com Rickettsia sp., geneticamente relacionada a vários endossimbiontes riquetsiais de carrapatos do complexo Ixodes ricinus. R. parkeri é reconhecidamente um patógeno humano em alguns países americanos, incluindo a Argentina, onde um estudo recente incriminou A. tigrinum como um provável vetor. Aves poderiam desempenhar um papel importante na dispersão de carrapatos A. tigrinum infectados por R. parkeri. Em adição, relata-se pela primeira vez a infecção por Rickettsia em I. pararicinus.

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Rickettsia infection in Amblyomma tonelliae, a tick species from the Amblyomma cajennense complex

Cited by 21 publications

References 43 publications

Vectorial competence of Amblyomma tonelliae to transmit Rickettsia rickettsii

Vectorial competence of Amblyomma tonelliae to transmit Rickettsia rickettsii

Ecology and genetic variation of Amblyomma tonelliae in Argentina

Rickettsial infection in ticks infesting wild birds from two eco-regions of Argentina

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