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Instituto Nacional de Salud Pública

2020, Number 4

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salud publica mex 2020; 62 (4)

Detection of Rickettsia typhi in Rhipicephalus sanguineus s.l. and Amblyomma mixtum in South of Mexico

Ulloa-García A, Dzul-Rosado K, Bermúdez-Castillero SE, López-López N, Torres-Monzón JA

Language: Spanish
References: 31
Page: 358-363
PDF size: 272.43 Kb.


ABSTRACT

Objective. To determine the presence of Rickettsia typhi in Rhipicephalus sanguineus s.l. and Amblyomma mixtum in southern Mexico. Materials and methods. Ticks were collected in humans and domestic animals. The presence of Rickettsia was determined by PCR and sequencing. Results. 10/39 work vials amplified fragments of the gltA, htrA and ompB genes. On 7/10 from Rh. sanguineus s.l. collected from dogs and in 3/10 of A. mixtum collected from horse and human. Sequencing indicated R. typhi in Rh. sanguineus and A. mixtum with 100% homology (LS992663.1) for a region of the htrA gene and 99% (LS992663.1) with the regions of the gltA and OmpB genes. The minimum infection rate (TMI) for R. typhi was 3.88. Conclusions. Rhipicephalus sanguineus s.l. and Amblyomma mixtum are naturally infected with R. typhi in Southern Mexico.


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