Resumo

CUORE, U; SOLARI, MA  e  TRELLES, A. Current status of resistance and first diagnostic of multiple resistance Rhipicephalus (Boophilus) microplus tick simultaneously resistant to five drugs in Uruguay. Veterinaria (Montev.) [online]. 2017, vol.53, n.205, pp.2-2. ISSN 0376-4362.

Summary In Uruguay during the last decade, the diagnosis of resistance has been completed to most of the active ingredients used in the control of Rhipicephalus (Boophilus) microplus tick, excepting fluazuron. This has led to a difficult tick control in many farms. As a result of this situation official diagnosis of resistance had increased. Between January 2015 and July 2016, 116 samples were analyzed through bioassay techniques. The results showed the presence of 13 tick resistant populations simultaneously to organophosphate, synthetic pyrethroids, amitraz, fipronil and macrocyclic lactones, referring to this phenomenon as multiple resistance ticks. These tick populations were 11 originated from the location of Artigas, 1 from Salto and 1 from Paysandu. The study was not conducted with random samples, instead, the samples were sent by veterinaries interested in resistance diagnosis. Macrocyclic lactones were the active ingredient with lower percentage of resistant ticks, 33%, while pyrethroids showed the most important resistance 91 %, organophosphates represented 44%, amitraz and fipronil showed respectively 39 and 48% resistance from the studied samples. The study showed that 53.3% of cases had maximum resistance for two active ingredients while 29.3% showed resistance either to 4 or to 5 active ingredients at the same time. More dissemination and extension of knowledge available is needed, therefore to avoid developing multiple resistance ticks and is needed new knowledge to be generated, which may answer the need for a rational control of ticks which already have multiple resistance preventing its spread

Palavras-chave : Multiple resistance; tick; Rhipicephalus (Boophilus) microplus.

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