Volume 20, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Weanling lambs were inoculated by intraperitoneal, intravenous, and subcutaneous routes with 10 or 10 egg 50% infectious doses of the ZRS strain of . Control lambs were inoculated with identical amounts of the same infectious material inactivated with formalin. Tissue and blood samples from animals inoculated with infectious material were tested for the presence of rickettsiae by inoculation into embryonated eggs, guinea pigs, and meadow voles () and by fluorescence microscopy with specific antiserum. Generalized rickettsial infections in lambs were not produced despite the use of various routes of inoculation. was isolated in some instances from brain, lung, spleen, liver, and subcutaneous tissue 6 or 7 days after inoculation, but not 29 days after inoculation. Rickettsemia was not demonstrated under any of the conditions tested. Serological and clinical responses in lambs receiving infectious inocula were not distinguishable from corresponding responses in lambs that had received comparable amounts of formalin-killed inoculum. The pattern of isolations of from various lamb tissues was consistent with a picture of local self-limited infections unaccompanied by rickettsemia. These findings are compared with those obtained from infected guinea pigs and are discussed with regard to the hypothesis of extrahuman reservoirs of .


Article metrics loading...

The graphs shown below represent data from March 2017
Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error