Excerpt:

RESULTS: B. henselae and related
bacterial species are transmitted among cats and dogs by
arthropod vectors. In the absence of these vectors, disease does
not spread amongst the animals. On the other hand, disease can be
spread to humans by bite and scratch as well as by arthropod
vectors. Animals commonly infected with B. henselae and arthropod
vectors are discussed. 
CONCLUSIONS: Clinicians should be aware that a common illness,
cat scratch disease, can be transmitted by arthropod vectors and
a history of an animal scratch or bite is not necessary for
disease transmission.