Abstract
In this study, a possible role of the cat flea (Ctenocephalides felis) in transmitting feline calicivirus (FCV) was examined. Fleas were fed via artificial membranes with FCV-spiked bovine blood, free of anti-FCV antibodies. Flea feces were collected daily for 10 days and incubated at room temperature. Infectivity of the feces was tested in vitro using Crandell-Reese Feline Kidney (CRFK) cells. FCV remained infectious for 8 days. These flea feces were also used to oronasally inoculate four specific pathogen-free (SPF) kittens. All kittens were successfully infected as demonstrated by virus isolation from pharyngeal swabs and seroconversion. Two of the cats showed, in addition, clinical signs. Besides the infection of cats with flea feces containing FCV, four SPF kittens were exposed to fleas that were fed with FCV-spiked bovine blood. One of the kittens was successfully infected via this route as demonstrated by virus isolation from pharyngeal swabs and virus isolation. The results of this study show that fleas can spread infectious virus through their feces or by stitch and must be considered a source of infection for uninfected cats.
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