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Efeitos toxicológicos e ineficiência in vitro de deltametrina sobre larvas de Rhipicephalus sanguineus, de Goiania, Goiás, Brasil
Fernandes Fernando de Freitas,Freitas Edméia de Paula e Souza,Silva José Rubens Veríssimo da,Silva Oyama Rodrigues da
Revista da Sociedade Brasileira de Medicina Tropical , 2001,
Abstract: Observou-se que formula es de deltametrina, desenvolvidas para desinsetizar ambientes infestados ou para combate de artrópodes parasitas de bovinos e equinos, têm sido freqüentemente utilizadas por cinofilistas para combater carrapatos em seus c es, sem critério científico em rela o às dosagens e formas de aplica o, nos canis e ambientes onde vivem. Com a finalidade de avaliar a atividade deste produto sobre Rhipicephalus sanguineus, realizaram-se bioensaios com larvas a 27±1°C, UR>80% e fotofase de 12h. A mortalidade e os efeitos toxicológicos foram observados durante 30h, a cada 6h. Constataram-se efeitos toxicológicos importantes nas larvas, tais como incoordena o, Knock-down e paralisia seguida por morte, todavia a capacidade letal do produto após 30h foi baixa, com mortalidade média de 34%, 40,2%, 46% e 57,6%, respectivamente, para as dosagens de 0,5ml, 1ml, 2ml, 3ml. N o houve mortalidade no grupo controle. Os resultados obtidos contra-indicam o uso da deltametrina nas dosagens testadas como medida eletiva para controle de R. sanguineus.
PRIMER REGISTRO DE RHIPICEPHALUS SANGUINEUS (LATREILLE, 1806) (ACARI: IXODIDAE) EN RATTUS NORVEGICUS (MAMMALIA: RODENTIA) EN CHILE
González-Acu?a,Daniel; Venzal,José M.; Guglielmon,Alberto A.;
Gayana (Concepción) , 2003, DOI: 10.4067/S0717-65382003000100015
Abstract: a male rhipicephalus sanguineus was found on a rattus norvegicus in the city of chillán (chile). this is the first record on this host in chile. the hypothetical sanitary importance of the finding is discussed
Study on seasonal activity in dogs and ehrlichial infection in Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae) from southern Uruguay
VENZAL,JOSE M; ESTRADA PENA,AGUSTíN; CASTRO,OSCAR; DE SOUZA,CARLOS G; PORTILLO,ARáNZAZU; OTEO,JOSé ANTONIO;
Parasitología latinoamericana , 2007, DOI: 10.4067/S0717-77122007000100004
Abstract: the seasonal activity on dogs of rhipicephalus sanguineus in southern uruguay has been studied from samples collected in veterinary clinics of the country. from a total of 744 specimens, adults (92%) were active on dogs between august and march (peaking in october) being absent between april and july. immatures represent more than 80% of captures on dogs in summer. this pattern is well correlated with the climate records in the zone. the search for ehrlichial dna from tick-derived extracts (36 pools from 180 ticks) was negative in all the cases. while r. sanguineus has been incriminated as vector of these pathogens, additional studies are required to understand the role of this tick in the transmission of ehrlichial organisms
Study on seasonal activity in dogs and ehrlichial infection in Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae) from southern Uruguay
JOSE M VENZAL,AGUSTíN ESTRADA PENA,OSCAR CASTRO,CARLOS G DE SOUZA
Parasitología latinoamericana , 2007,
Abstract: The seasonal activity on dogs of Rhipicephalus sanguineus in southern Uruguay has been studied from samples collected in veterinary clinics of the country. From a total of 744 specimens, adults (92%) were active on dogs between August and March (peaking in October) being absent between April and July. Immatures represent more than 80% of captures on dogs in summer. This pattern is well correlated with the climate records in the zone. The search for ehrlichial DNA from tick-derived extracts (36 pools from 180 ticks) was negative in all the cases. While R. sanguineus has been incriminated as vector of these pathogens, additional studies are required to understand the role of this tick in the transmission of ehrlichial organisms La actividad estacional de Rhipicephalus sanguineus en perros del sur de Uruguay se ha estudiado mediante muestras colectadas en clínicas veterinarias. De un total de 744 especimenes, los adultos (92%) tienen su actividad en los perros entre agosto y marzo (alcanzando el máximo en octubre) estando ausentes entre abril y julio. Los inmaduros representan más de 80% de las capturas en los perros en verano. Este modelo se correlaciona con los datos climáticos de la zona. La búsqueda de ADN ehrlichial en el extracto de garrapatas (36 pooles de 180 garrapatas) fue negativo en todos los casos. R. sanguineus se ha incriminado como vector de estos patógenos, por lo que se requieren estudios adicionales para entender el papel de esta garrapata en la transmisión de estos organismos ehrlichiales
Larvicidal potencial of Sapindus saponaria (Sapindaceae) against Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae)
Fernandes, F.F.;Leles, R.N.;Silva, I.G.;Freitas, E.P.S.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2007, DOI: 10.1590/S0102-09352007000100024
Abstract: the larvicidal potential of the crude ethanolic extracts (cee) of the stem peel of sapindus saponaria was evaluated against rhipicephalus sanguineus. lethal concentrations (lc), were calculated by preparing cee solutions at different concentrations in distilled water. larvae fasted for 14-21 days were utilized in the bioassays, after incubation of engorged females collected from infested environments frequented by dogs in several neighborhoods of goiania, go. bioassays were performed in a specially constructed biological chamber for testing botanical acaricides, acclimatized to 27±1oc, rh>80%. the larvae were counted on filter paper envelopes impregnated with the solutions or distilled water and larval mortality observed after 48h. s. saponaria showed good larvicidal activity (lc50 and lc99 of 1994 and 3922ppm, respectively) and the results demonstrated its potential as a botanical acaricide and an alternative control measure for r. sanguineus.
Distribution of Rickettsia rickettsii in ovary cells of Rhipicephalus sanguineus (Latreille1806) (Acari: Ixodidae)
Luís da Silva Costa, Pablo Nunes, Jo?o Soares, Marcelo Labruna, Maria Camargo-Mathias
Parasites & Vectors , 2011, DOI: 10.1186/1756-3305-4-222
Abstract: The results showed a general distribution of R. rickettsii in the ovary cells, being found in oocytes in all stages of development (I, II, III, IV and V) most commonly in the periphery of the oocyte and also in the cytoplasm of pedicel cells.The histological analysis of the ovaries of R. sanguineus infected females confirmed the presence of the bacterium, indicating that the infection can interfere negatively in the process of reproduction of the ticks, once alterations were detected both in the shape and cell structure of the oocytes which contained bacteria.Rickettsia rickettsii, the etiological agent of Brazilian Spotted Fever (BSF) in Brazil and Rocky Mountain Spotted Fever in the United States [1] is an obligatory intracellular gram-negative bacterium which survives for a short time out of the host [2], being transmitted to humans and other animals by different species of ticks. These organisms are usually 0.8 to 2 μm long, with a diameter of 0.3 to 0.5 μm [3] and having a cellular wall formed by peptidoglycan and lipopolysaccharides [4]. The infection caused by rikettsiae is systemic in ticks as they multiply in the cytoplasm of the intestine, ovaries, salivary glands, Malpighian tubules cells and are also found in the hemolymph of the ectoparasite [5]. Following infection of the ovaries, transstadial and transovarial transmission of the pathogen can happen [6].Rickettsia rickettsii is considered the most pathogenic species of rickettsia, being reported in Canada, United State, Mexico, Costa Rica, Panama, Brazil, Colombia and Argentina [7]. Many ticks are known as vectors of R. rickettsia in the world. In Brazil the known vectors are Amblyomma cajennense, tick vector in most of the endemic areas in the country and A. aureolatum, responsible for the transmission in some metropolitan areas of S?o Paulo [8,9]. Recent studies point to R. sanguineus as a possible vector of R. rickettsii for humans in some regions of Brazil. Moraes-Filho et al. [10] reported the pre
Efeitos toxicológicos e ineficiência in vitro de deltametrina sobre larvas de Rhipicephalus sanguineus, de Goiania, Goiás, Brasil
Fernandes, Fernando de Freitas;Freitas, Edméia de Paula e Souza;Silva, José Rubens Veríssimo da;Silva, Oyama Rodrigues da;Silva, Ionizete Garcia da;
Revista da Sociedade Brasileira de Medicina Tropical , 2001, DOI: 10.1590/S0037-86822001000200002
Abstract: it has been observed that formulations of deltamethrin developed for disinsectization of infested places and control of parasitic arthropods of bovines and equines have frequently been used by breeders of dogs to control ticks in their animals and kennels, but without due consideration of the correct dosage or means of application. with the purpose of evaluating the efficacy of this product on rhipicephalus sanguineus, bioassays were realized with larvae at 27±1°c, ur>80% and light period of 12 hours. the mortality and toxicological effects were observed for 30h, at 6h intervals. important toxicological effects were observed on the larvae, such as lack of co-ordination, knock-down and paralysis followed by death, although the lethal capacity of the product after 30h was low, with mean mortality of only 34%, 40.2%, 46% and 57.6% respectively, for the 0.5ml/l; 1ml/l; 2ml/l/; and 3ml/l dosages. there was no mortality in the control group. the results obtained did not indicate the use of this formulation, in the tested dosages, as a method of choice for r. sanguineus control.
PRIMER REGISTRO DE RHIPICEPHALUS SANGUINEUS (LATREILLE, 1806) (ACARI: IXODIDAE) EN RATTUS NORVEGICUS (MAMMALIA: RODENTIA) EN CHILE FIRST RECORD OF RHIPICEPHALUS SANGUINEUS (LATREILLE, 1806) (ACARI: IXODIDAE) IN RATTUS NORVEGICUS (MAMMALIA: RODENTIA) IN CHILE  [cached]
Daniel González-Acu?a,José M. Venzal,Alberto A. Guglielmon
Gayana (Concepción) , 2003,
Abstract: Se registra por primera vez en Chile a Rhipicephalus sanguineus parasitando a un huarén (Rattus norvegicus) en la ciudad de Chillán. Se discute la importancia sanitaria hipotética de este hallazgo A male Rhipicephalus sanguineus was found on a Rattus norvegicus in the city of Chillán (Chile). This is the first record on this host in Chile. The hypothetical sanitary importance of the finding is discussed
Efficiency of the latex from Euphorbia splendens var. hislopii (N.E. Br.) Ursch & Leandri, Euphorbiaceae, in the control of Rhipicephalus (Boophilus) sanguineus (Latreille, 1806) (Acari: Ixodidae)
Pinto, Zeneida T.;Queiroz, Margareth M. C.;Barbosa, Júlio V.;
Revista Brasileira de Farmacognosia , 2011, DOI: 10.1590/S0102-695X2011005000041
Abstract: the aim of this study was to evaluate the effect of the latex from euphorbia splendens var. hislopii (n.e. br.) ursch & leandri, euphorbiaceae, on the eggs and engorged larvae of rhipicephalus (b.) sanguineus (latreille, 1806) (acari: ixodidae). six aqueous concentrations: 25, 50, 100, 125, 250 and 500 μl/l of the latex of this plant were tested. the control group was tested only with distilled water. the latex of e. splendens var. hislopii presented an ld50 of 18.031 μl/l and ld90 of 84.610 μl/l against the eggs of r. (b.) sanguineus. the larvae of all the groups treated with the latex presented a low survival rate of 0% at 25 μl/l, 1% at 50 μl/l, 2% at 100 μl/l, 3% at 125 μl/l, 9% at 250 μl/l, 5% at 500 μl/l when compared with the control group (91%). on day 7 and 14 after the application the latex killed more efficiently the treated groups (25, 50, 100, 125, 250 and 500 μl/l). as from day 21 the latex became less effective for all treatments. our results clearly show that the aqueous concentration of the latex have a strong effect on tick eggs and larvae suggesting that it could become an important acaricide.
Efficiency of the latex from Euphorbia splendens var. hislopii (N.E. Br.) Ursch & Leandri, Euphorbiaceae, in the control of Rhipicephalus (Boophilus) sanguineus (Latreille, 1806) (Acari: Ixodidae)  [cached]
Zeneida T. Pinto,Margareth M. C. Queiroz,Júlio V. Barbosa
Revista Brasileira de Farmacognosia , 2011,
Abstract: The aim of this study was to evaluate the effect of the latex from Euphorbia splendens var. hislopii (N.E. Br.) Ursch & Leandri, Euphorbiaceae, on the eggs and engorged larvae of Rhipicephalus (B.) sanguineus (Latreille, 1806) (Acari: Ixodidae). Six aqueous concentrations: 25, 50, 100, 125, 250 and 500 μL/L of the latex of this plant were tested. The control group was tested only with distilled water. The latex of E. splendens var. hislopii presented an LD50 of 18.031 μL/L and LD90 of 84.610 μL/L against the eggs of R. (B.) sanguineus. The larvae of all the groups treated with the latex presented a low survival rate of 0% at 25 μL/L, 1% at 50 μL/L, 2% at 100 μL/L, 3% at 125 μL/L, 9% at 250 μL/L, 5% at 500 μL/L when compared with the control group (91%). On day 7 and 14 after the application the latex killed more efficiently the treated groups (25, 50, 100, 125, 250 and 500 μL/L). As from day 21 the latex became less effective for all treatments. Our results clearly show that the aqueous concentration of the latex have a strong effect on tick eggs and larvae suggesting that it could become an important acaricide.
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