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Marcelo B. Labruna
University of São Paulo
VirologyIxodidaeTickRickettsiaBiology
602Publications
57H-index
13.1kCitations
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#1Alejandro Ramírez-Hernández (USP: University of São Paulo)H-Index: 5
Last. Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
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#1Matias Pablo Juan Szabó (UFU: Federal University of Uberlandia)H-Index: 29
#2Thiago F. Martins (USP: University of São Paulo)H-Index: 32
Last. Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
view all 12 authors...
Abstract Information about human tick bites in Brazil is mostly anecdotal. Published information is typically restricted to single tick infestation episodes and does not address human exposure occurring on a daily basis in natural, rural, or green urban areas. We present a comprehensive 2-yr study on human parasitism during a broad survey on ticks within a Brazilian savannah reserve. Overall, 439 tick bites were recorded from the following species: Amblyomma sculptum (n = 331 bites), Amblyomma p...
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#1Álvaro A. Faccini-Martínez (UFES: Universidade Federal do Espírito Santo)H-Index: 8
#2Sebastián Muñoz-Leal (USP: University of São Paulo)H-Index: 10
Last. Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
view all 10 authors...
Abstract Since 2010, a new rickettsiosis caused by Rickettsia parkeri, a species included in the spotted fever group (SFG) and transmitted by the tick Amblyomma ovale, has been described in Brazil. Considering that A. ovale does occur in the Espirito Santo state (ES), the present study aimed at preliminarily describing the epidemiology of R. parkeri in the Atlantic forest of this state. Between June 2016 and September 2018, 33 villages from nine municipalities of the ES were included in a study ...
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#1Hermes Ribeiro Luz (UFMA: Federal University of Maranhão)H-Index: 9
#2Alejandro Ramírez-Hernández (USP: University of São Paulo)H-Index: 5
Last. Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
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ABSTRACT Brazilian spotted fever (BSF), caused by the bacterium Rickettsia rickettsii, is transmitted to humans mainly by the tick Amblyomma sculptum in southeastern Brazil. In most BSF-endemic areas A. sculptum populations are sustained chiefly by capybaras (Hydrochoerus hydrochaeris), which are also the host of another tick species, Amblyomma dubitatum, not implicated in R. rickettsii transmission. Herein, we evaluated the effects of relative humidity (RH), temperature, and water immersion on ...
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#1Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
#2Valeria C. Onofrio (Instituto Butantan)H-Index: 17
Last. Alberto A. GuglielmoneH-Index: 33
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Abstract Ixodes fuscipes Koch, 1844 , described from Brazil, has been considered a valid species with records from Brazil and Peru. Ixodes spinosus Neumann, 1899 , also described from Brazil, has been considered a synonym of I. fuscipes. In 2014, Ixodes aragaoi Fonseca 1935 was redescribed as a valid species for Brazil and Uruguay. Until the present study, one major difference between the females of I. fuscipes and I. aragaoi was the horn-like auriculae in the former versus the ridge-like auricu...
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Abstract Caatinga is a biome exclusive to the semiarid zone of Brazil, where studies on ticks and tick-borne diseases are scarce. Herein, we investigated the occurrence of Rickettsia, Ehrlichia, and Coxiella in wild mammals, domestic dogs and their ectoparasites using molecular and serological techniques. During 2014–2016, blood samples and ectoparasites were collected from 70 small mammals (51 rodents, 18 marsupials, 1 wild canid) and 147 domestic dogs in three areas of the Caatinga. Through se...
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#1Sebastián Muñoz-Leal (USP: University of São Paulo)H-Index: 10
#2Daniel González-Acuña (UdeC: University of Concepción)H-Index: 18
Last. José M. VenzalH-Index: 27
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The soft tick Ornithodoros peruvianus Kohls, Clifford & Jones, 1969 was described as a parasite of bats in Peru upon the examination of engorged larvae only. Recently, larvae of this tick species were reported on bats from northern Chile. However, the adult and nymphal stages of O. peruvianus have remained undescribed. This study aimed to redescribe the larva of O. peruvianus based on unfed specimens, and to describe nymphs, the male and the female of this species. Ticks were collected on the wa...
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#1Thiago C. Dias (Smithsonian Institution)
#1Thiago da Costa Dias (UFSCar: Federal University of São Carlos)H-Index: 1
Last. Hector R. Benatti (USP: University of São Paulo)H-Index: 3
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Human activities are changing landscape structure and function globally, affecting wildlife space use, and ultimately increasing human-wildlife conflicts and zoonotic disease spread. Capybara (Hydrochoerus hydrochaeris) is a conflict species that has been implicated in the spread and amplification of the most lethal tick-borne disease in the world, the Brazilian spotted fever (BSF). Even though essential to understand the link between capybaras, ticks and the BSF, many knowledge gaps still exist...
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#1Sebastián Muñoz-Leal (USP: University of São Paulo)H-Index: 10
#2José M. VenzalH-Index: 27
Last. Marcelo B. Labruna (USP: University of São Paulo)H-Index: 57
view all 7 authors...
Abstract A new argasid (Argasidae) tick is herein described based on morphology and molecular data obtained from larvae parasitizing Octodon degus and from ticks collected inside burrows in northern Chile. Unfed laboratory-reared larvae were mounted in slides for morphometrical and morphological analyses. Larvae of Ornithodoros octodontus n. sp. share morphological traits with Ornithodoros quilinensis and Ornithodoros xerophylus, two species associated with rodents in the Argentinean Chaco. Howe...
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