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[Studies on the retention of R. burneti in Rh. bursa and H. detritum ticks].

The role played by ixodes ticks in the epizootiology and epidemiology of Q fever was studied by following up the transphasal and transovarial passing of Rickettsia burnetii in ticks of the Rhipicephalus bursa and Hyalomma detritum species. Use was made of the 269th passage of the rickettsial strain BP, isolated in this country from sheep. The infection was followed up from larva Ist generation to larva IInd generation of the two ticks. In 10 out of the eleven samples of ticks studied there were rickettsiae in all developmental stages of the ticks, and this pointed to the phase transmission of strain BP via the metamorphosis. Of all 16 samples of eggs and second generation larvae of infected ticks, three egg samples were positive of both species of ticks, and one samples of larvae was positive of H. detritum ticks. Results showed that the infection may be passed transovarially, however, in a comparatively low per cent.