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      Detección de Rickettsia rickettsii Brumpt (Rickettsiales: Rickettsiaceae) en la garrapata café del perro Rhipicephalus sanguineus Latreille (Ixodida: Ixodidae) en la Comarca Lagunera, zona reemergente de Fiebre Manchada en México Translated title: Detection of Rickettsia rickettsii Brumpt (Rickettsiales: Rickettsiaceae) in the brown dog tick Rhipicephalus sanguineus Latreille (Ixodida: Ixodidae) in the Comarca Lagunera, a reemergent Spotted Fever zone in Mexico

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          Abstract

          Resumen: La Fiebre Manchada de las Montañas Rocosas es una enfermedad reemergente en la Comarca Lagunera, ya que en los últimos años se han reportado numerosos casos en pacientes humanos. Para detectar la presencia de Rickettsia rickettsii (Brumpt, 1922) en la garrapata café del perro, se realizaron colectas aisladas en siete áreas rurales y una área periurbana de la Comarca Lagunera de Coahuila y Durango, durante junio 2015 a febrero 2016. Se colectaron de manera directa 840 garrapatas hembras a repleción sobre 168 perros domésticos (cinco garrapatas por perro), las cuales se depositaron en viales de 2 ml. Las garrapatas se llevaron al Laboratorio de Parasitología de la Universidad Autónoma Agraria Antonio Narro Unidad Laguna, donde se identificaron como Rhipicephalus sanguineus (Latreille, 1806). Para el análisis molecular se eligieron al azar 3 garrapatas por muestra para conformar 195 pools, en cada uno de los cuales se realizó la extracción de órganos internos y contenido estomacal. Para obtener ADN de cada pool se empleó la técnica del CTAB, se amplificó el gen gltA mediante ensayos de PCR usando un termociclador y un iniciador genérico (Forward: RpCS.877p, Reverse: RpCS.1258n). Ocho pools resultaron positivos a Rickettsia rickettsii con una frecuencia del 6.9% (2/29) en la colonia Leticia Herrera (Gómez Palacio, Durango), un pool positivo (1/26= 3.85%) para Parras (Coahuila) y cinco pools para el municipio de Matamoros, Coahuila correspondientes a los ejidos Granada (2/28=7.1%), Alamito (1/23=4.35%), Consuelo (1/32= 3.13%) y Vizcaya (1/19=5.25%). Por medio de una secuenciación se obtuvo una identidad del 100% a la cepa Brasileña 647 (KJ588069.1) de Rickettsia rickettsii y 99% de similitud con las extracciones del InDRE (KU587806.1 y KT881097.1).

          Translated abstract

          Abstract: Rocky Mountain Spotted fever is a reemergent disease in the Comarca Lagunera, since numerous human cases have been reported in the last few years. In order to detect the presence of Rickettsia rickettsii Brumpt in dog´s brown ticks, single collections of ticks were conducted in seven rural areas and a periurban area in the Comarca Lagunera of Coahuila and Durango from June 2015 through february 2016. Direct collection of 840 engorged female ticks on 168 home dogs was carried out (5 ticks per dog), which were contained in two ml vials. Ticks were identified as Rhipicephalus sanguineus Latreille in the Parasitology Laboratory of the Universidad Autonoma Agraria Antonio Narro Unidad Laguna. For the molecular analysis three ticks per sample ticks were randomly selected, forming 195 pools. Each tick was subjected to extraction of internal organs and stomachal content. CTAB technique was used on each pool in order to obtain DNA, gltA gene was amplified using PCR assays with thermocyclator and a generic primer (Forward: RpCS.844p, Reverse: RpCS. 1258n). Eight pools resulted positive to Rickettsia rickettsii with a frecuency of 6.9% (2/29) in the colony Leticia Herrera (Gomez Palacio, Durango), one (1/26= 3.85%) for Parras (Coahuila) and five pools for the municipality of Matamoros (Coahuila) in Granada (2/28=7.1%), Alamito (1/23=4.35%), Consuelo (1/32=3.13%) and Vizcaya (1/19=5.25%). By means of sequenciation 100% identification for Rickettsia rickettsii Brazilian strain 647 (KJ588069.1) and 99% for InDRE stractions (KU587806.1 and KT881097.1) were obtained.

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          A rapid DNA isolation procedure for small quantities of fresh leaf tissue.

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            Genotypic identification of rickettsiae and estimation of intraspecies sequence divergence for portions of two rickettsial genes.

            DNA sequences from specific genes, amplified by the polymerase chain reaction technique, were used as substrata for nonisotopic restriction endonuclease fragment length polymorphism differentiation of rickettsial species and genotypes. The products amplified using a single pair of oligonucleotide primers (derived from a rickettsial citrate synthase gene sequence) and cleaved with restriction endonucleases were used to differentiate almost all recognized species of rickettsiae. A second set of primers was used for differentiation of all recognized species of closely related spotted fever group rickettsiae. The procedure circumvents many technical obstacles previously associated with identification of rickettsial species. Multiple amplified DNA digest patterns were used to estimate the intraspecies nucleotide sequence divergence for the genes coding for rickettsial citrate synthase and a large antigen-coding gene of the spotted fever group rickettsiae. The estimated relationships deduced from these genotypic data correlate reasonably well with established rickettsial taxonomic schemes.
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              Rocky Mountain spotted fever from an unexpected tick vector in Arizona.

              Rocky Mountain spotted fever is a life-threatening, tick-borne disease caused by Rickettsia rickettsii. This disease is rarely reported in Arizona, and the principal vectors, Dermacentor species ticks, are uncommon in the state. From 2002 through 2004, a focus of Rocky Mountain spotted fever was investigated in rural eastern Arizona. We obtained blood and tissue specimens from patients with suspected Rocky Mountain spotted fever and ticks from patients' homesites. Serologic, molecular, immunohistochemical, and culture assays were performed to identify the causative agent. On the basis of specific laboratory criteria, patients were classified as having confirmed or probable Rocky Mountain spotted fever infection. A total of 16 patients with Rocky Mountain spotted fever infection (11 with confirmed and 5 with probable infection) were identified. Of these patients, 13 (81 percent) were children 12 years of age or younger, 15 (94 percent) were hospitalized, and 2 (12 percent) died. Dense populations of Rhipicephalus sanguineus ticks were found on dogs and in the yards of patients' homesites. All patients with confirmed Rocky Mountain spotted fever had contact with tick-infested dogs, and four had a reported history of tick bite preceding the illness. R. rickettsii DNA was detected in nonengorged R. sanguineus ticks collected at one home, and R. rickettsii isolates were cultured from these ticks. This investigation documents the presence of Rocky Mountain spotted fever in eastern Arizona, with common brown dog ticks (R. sanguineus) implicated as a vector of R. rickettsii. The broad distribution of this common tick raises concern about its potential to transmit R. rickettsii in other settings. Copyright 2005 Massachusetts Medical Society.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                azm
                Acta zoológica mexicana
                Acta Zool. Mex
                Instituto de Ecología A.C. (Xalapa, Veracruz, Mexico )
                0065-1737
                2448-8445
                2017
                : 33
                : 2
                : 339-344
                Affiliations
                [1] Torreón orgnameUniversidad Autónoma Agraria Antonio Narro Mexico acm_sultan@ 123456hotmail.com
                Article
                S0065-17372017000200339
                6922b6dd-641b-4b91-98b3-1c439a3ae2e4

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 07 October 2016
                : 04 May 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 27, Pages: 6
                Product

                SciELO Mexico


                CTAB technique,Rickettsia rickettsii,spotted fever,ticks,Fiebre Manchada,garrapatas,técnica CTAB

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