absence of the symbiont candidatus midichloria mitochondrii in the mitochondria of the tick ixodes holocyclus. | candidatus midichloria mitochondrii (m. mitochondrii) belongs to a novel clade of bacteria within the order rickettsiales. recent pcr-based screening studies indicate that it is present in a number of blood-sucking arthropods, as well as the blood of some vertebrates. its medical and veterinary significance remains to be determined. electron microscopic examinations of m. mitochondrii have thus far been conducted on two infected tick species. remarkably, the bacterium was found in abundance with ... | 2009 | 19732154 |