Abstract
ABSTRACT The seasonal activity on dogs of Rhipicephalus sanguineus in southern Uruguay has been studiedfrom 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 betweenApril and July. Immatures represent more than 80% of captures on dogs in summer. This pattern is wellcorrelated with the climate records in the zone. The search for ehrlichial DNA from tick-derivedextracts (36 pools from 180 ticks) was negative in all the cases. While R. sanguineus has beenincriminated as vector of these pathogens, additional studies are required to understand the role ofthis tick in the transmission of ehrlichial organisms. Key words : Rhipicephalus sanguineus , seasonal activity, dogs, absence of ehrlichial DNA,Uruguay. INTRODUCTIONAbout 74 species are currently recognized inthe tick genus Rhipicephalus Koch, 1844 1 . Rhipicephalus sanguineus is probably the mostwidely distributed tick in the World. It is foundcircumglobally approximately between thelatitudes 50oN and 42oS. Its preferences for dogsas main host have facilitated its worldwidedistribution
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