1 23 Experimental and Applied Acarology ISSN 0168-8162 Volume 52 Number 4 Exp Appl Acarol (2010) 52:383-392 DOI 10.1007/ s10493-010-9375-7 Co-feeding as a route for transmission of Rickettsia conorii israelensis between Rhipicephalus sanguineus ticks