Lack of transovarial transmission of Bartonella by rodent fleas

In this issue of Molecular Ecology, Morick et al. (2011) present an interesting study of acquisition and transmission of Bartonella by Xenopsylla ramesis fleas (Fig. 1) which infest naturally wild desert rodents from the Ne-gev desert. A major issue with vector-borne diseases and vector-borne infection is to know whether the vector can also be a natural reservoir and transmit the infectious agent transovarially, allowing the infection to be perpetuated through successive generations of vectors. The desert flea, X. ramesis, is a flea species parasitizing gerbilline rodents in the deserts of the Middle East (Fielden et al. 2004).