http://www.liebertonline.com/doi/abs/10.1089/vbz.2010.0137
Vector-Borne and Zoonotic Diseases
Acquisition of Rickettsia felis by Cat Fleas During Feeding
To cite this article:
Kathryn E. Reif, Michael T. Kearney, Lane D. Foil and Kevin R. Macaluso.
Vector-Borne and Zoonotic Diseases. July 2011, 11(7): 963-968.
doi:10.1089/vbz.2010.0137.
Published in Volume: 11 Issue 7: July 7, 2011
Online Ahead of Print: January 9, 2011
Abstract
Evidence for horizontal routes of transmission for Rickettsia felis has
come from detection of R. felis infection in vertebrates and multiple
blood-feeding arthropods; however, infection of cat fleas,
Ctenocephalides felis, during blood feeding has not been demonstrated.
In this study, the ability of cat fleas to acquire R. felis through an
infectious blood meal with subsequent vertical transmission was
examined. Utilizing an artificial feeding system, Rickettsia-naive fleas
were exposed to R. felis–infected blood meals and monitored for
subsequent infection at weekly intervals for 4 weeks. At 7 days
postexposure (dpe) 52% of fleas successfully acquired rickettsiae and R.
felis DNA; rickettsial transcript and DNA was detected in cat flea
feces. Quantitative real-time polymerase chain reaction determined that
both the R. felis infection load and R. felis infection density was
significantly greater in fleas assessed at later time points.
Although a persistent R. felis infection was detected in adult fleas, R.
felis infection was not observed in F1 progeny. This study demonstrates
that cat fleas are able to acquire R. felis infection from an infectious
blood meal and will serve as a model to examine R. felis transmission
between arthropod and vertebrate hosts.
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