Hereditary transmission of Theileria annulata infection in the tick, Hyalomma aegyptium neum

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Abstract
H. aegyptium, as an intermediate host of the protozoan T. annulata, has been shown to be capable of transmitting the disease to susceptible cattle through at least 4 generations without being exposed to renewed infection. Only the adult ticks can transmit the parasites since these latter do not seem to be able to escape from the intermediate host during its larval or nymphal stages. Laboratory dissections show that the parasite is present in the adults of the 7th generation of infected ticks, but no proof of their pathogenicity for cattle has been obtained beyond the 4th generation. Controls indicated that there had been no possibility of the successive generations of ticks getting a renewed infection during their individual lifetimes.