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Reassessment of the potential economic impact of cattle parasites in Brazil.
Economic losses caused by cattle parasites in Brazil were estimated on an annual basis, considering the total number of animals at risk and the potential detrimental effects of parasitism on cattle productivity, to be at least USD 13.96 billion. Expand
Detection of Rickettsia rickettsii in the tick Amblyomma cajennense in a new Brazilian spotted fever-endemic area in the state of Minas Gerais.
The present study showed molecular evidence for the presence of R. rickettsii in A. cajennense from a BSF-endemic area in Coronel Pacheco, state of Minas Gerais. Expand
Genetic diversity patterns of Haemonchus placei and Haemonchus contortus populations isolated from domestic ruminants in Brazil.
Analysis of genetic differentiation between isolates revealed that high rates of gene flow are operating among populations of both nematode species, including among those from different ruminant host species, consistent with the hypothesis of multiple origins of alleles associated with benzimidazole resistance. Expand
Coxiella symbiont in the tick Ornithodoros rostratus (Acari: Argasidae).
Results suggest a very long period of coevolution between ticks and Coxiella symbionts and indicates that the original infection may have occurred in an ancestor common to the 2 main tick families, Argasidae and Ixodidae. Expand
Rickettsial infections of dogs, horses and ticks in Juiz de Fora, southeastern Brazil, and isolation of Rickettsia rickettsii from Rhipicephalus sanguineus ticks
The results of the present study indicate a potential risk for transmission of R. rickettsii to humans by Rh. Expand
Study of the weight of eggs from six Ixodid species from Brazil
The generally large acarines included in the superfamily Ixodoidea apparently evolved as obligate parasites of Reptilia in the late Paleozoic or early Mezozoic era. During subsequent coevolution withExpand
Population dynamics of the free-living stages of Amblyomma cajennense (Fabricius, 1787) (Acari: ixodidae) on pastures of Pedro Leopoldo, Minas Gerais State, Brazil.
A study on the population behavior of Amblyomma cajennense larvae, nymphs and adult free-living stages was carried out in Pedro Leopoldo County, Minas Gerais State, Brazil, from July 1995 to JulyExpand
Identification of Some Chemical Components of the Essential Oil from Molasses Grass (Melinis minutiflora Beauv.) and their Activity Against Cattle-Tick (Boophilus microplus)
The essential oil of molasses grass (Melinis minutiflora Beauv.) has shown virtually 100% lethal effect on larvae of the cattle-tick (Boophilus microplus) within 10 min exposure. GC/MS analysis ofExpand
Life Cycle of the Tick Haemaphysalis Leporis-palustris (Acari: Ixodidae) Under Laboratory Conditions
The life cycles of two separate populations of the rabbit tick, Haemaphysalis leporis-palustris, were studied under laboratory conditions and Females fed S. brasiliensis were more successful to lay fertile eggs and showed the highest engorged and egg mass weights, and the highest CEIs. Expand
A novel Rickettsia infecting Amblyomma dubitatum ticks in Brazil.
A total of 130 adult free-living ticks of Amblyomma cajennense and 9 free-living Amblyomma dubitatum were collected in the surroundings of the Pampulha Lake, within Belo Horizonte city, state ofExpand