The objective of this study was to isolate, clone, and characterize a fragment of the vitellogenin (Vg) gene from a B. microplus tick strain from Mexico. Using cDNA and specific primers, an 1800-bp fragment was amplified, cloned, and transformed in into E. coli, and then sequenced. Comparative...

The aim of this study was to describe the genetics of amitraz resistance evolution and to obtain the independent genes number involved. Three Mexican R. microplus tick strains were used, one susceptible to all acaricides and two amitraz-resistant. Larvae were reared on isolated naïve-heifers and...

This manuscript provides a summary of the results presented at a symposium organized to accumulate information on factors that influence the prevalence of acaricide resistance and tick-borne diseases. This symposium was part of the 19th International Conference of the World Association for the...

A substitution (Phe→Ile) within the sodium channel gene sequence has been associated with pyrethroid resistance in Boophilus microplus[Rhipicephalus microplus]. The aim of the present study was to analyse the inheritance of pyrethroid resistance and the mutant allele, on reciprocal crosses of a...

Dialelic crosses and backcrosses of pyrethroid resistant (RR) and susceptible (SS) Rhipicephalus (Boophilus) microplus tick strains were carried out and the substitution (Phe-Ile) within the sodium channel gene was monitored in order to analyze the effects of the genotype on the pyrethroid...