| francisella-like endosymbiont dna and francisella tularensis virulence-related genes in brazilian ticks (acari: ixodidae). | ticks are vectors of a variety of pathogens, including francisella tularensis. bacteria in the genus francisella have been identified mostly in the northern hemisphere and include tick endosymbionts. francisella has never been described in brazil, where amblyomma spp. ticks are known as the vector of many bacterial zoonotic pathogens. in the present work, we have identified bacterial dna sequences with identity to francisella genes in amblyomma dubitatum neumann dermacentor nitens (neumann), and ... | 2009 | 19351090 |
| [seroprevalence anti-ehrlichia canis antibodies in dogs of cuiabá, mato grosso]. | canine ehrlichiosis is a disease transmitted by ticks rhipicephalus sanguineus and caused by ehrlichia canis, obligatory intracellular bacteria. the present study examined the prevalence of anti-e. canis in 254 dogs from four administrative regions of cuiabá, mato grosso, by indirect immunofluorescence assay. there was a prevalence of 42.5% (108/254) without significant difference between the studied regions. the variables age, breed, sex, habitat, access to rural and ticks were analyzed. the an ... | 2010 | 20624348 |
| applicability of in vitro bioassays for the diagnosis of ivermectin resistance in rhipicephalus microplus (acari: ixodidae). | the applicability of laboratory bioassays to diagnose ivermectin (ivm) resistance in rhipicephalus microplus was evaluated. adult immersion tests (aits), larval immersion tests (lits) and larval packet tests (lpts) were performed to characterise the effects of ivermectin toxicity on adults and larvae of a susceptible reference strain. the ait was determined to be a reasonable assay but requires a large number of individuals to attain interpretable results. the lit and lpt were validated with an ... | 2011 | 21978742 |
| acaricide resistance of rhipicephalus (boophilus) microplus in state of mato grosso do sul, brazil. | this study was conducted to obtain an epidemiological view of acaricide resistance in populations of rhipicephalus (boophilus) microplus in the state of mato grosso do sul. twenty-four tick samples were collected from municipalities in the state where farmers had reported concerns about resistance to or failure of tick control. these ticks were subjected to in vitro resistance detection assays using the adult immersion test (ait). the efficacy of alpha-cypermethrin, cypermethrin and amitraz trea ... | 2011 | 21722487 |