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From the Literature.

The detection of a novel Rickettsia species in a cat flea, Ctenocephalides felis, unsurprisingly led to its designation as Rickettsia felis, thus firmly linking it in our minds to domestic cats. Although R. felis DNA has been detected in a variety of arthropods, including fleas, ticks, and mites, these have not been associated with disease transmission and it is believed that its presence in these pests is the result of a blood meal from a rickettsemic host and represents a dead end for the microorganism. Only the cat flea has been demonstrated to transmit the organism transovarially and thus transfer the organism to its progeny. It serves as both the vector and arthropod reservoir of this organism. The cat flea, however, does not limit its residence to cats, having been detected on a variety of mammalian hosts [1]. This raises the question of whether felines are, in fact, the most important warm-blooded reservoir ofR. felis. R. felis–infected C. felis has been recovered from rodents, opossums, hedgehogs, horses, sheep, gerbils, and monkeys in addition to cats and domestic dogs (Canis lupus familiaris). There is no evidence, however, that these animals serve as reservoirs. The role of cats as a mammalian reservoir of R. felis has, in fact, come under question because many attempts to detect R. felis DNA in the blood of cats have been unsuccessful, although transient rickettsemia has recently been demonstrated after experimental infection. Prior work has shown that C. felis is the dominant flea found on dogs in Australia. Hii and colleagues in Brisbane examined the role of dogs as potential reservoir hosts ofR. felis. They detectedR. felisDNA by polymerase chain reaction (PCR) in the blood of 9 of 100 impounded healthyappearing dogs of various ages. This confirms a previous report of its detection in individual dogs in Spain and Germany in association with human cases of infection [2, 3]. These findings, together with the fact that naturally acquired infection has not been demonstrated by PCR in cats, suggests that dogs may be the major mammalian reservoir and source of human infection of R. felis. If so, this organism may have been poorly named.