الفهرس 
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Abstract
Dorcas Gazelles (Gazella Dorcas) are strict herbivorous and play an important role
in the ecological balance. As they are significant to the ecosystems in which they live.
These gazelles, as browsers, help to prevent plants from being overgrown. They are also
a source of food for carnivores. Dorcas Gazelles are susceptible to bacterial affections
such as members of Enterobacteriaceae as E. coli, Salmonella and Klebsiella. Dorcas
Gazelles in zoo and breeding center may be considered as a source of diseases not only
for other animals but also for human such as veterinarians, workers, and visitor. Such
close contact between wild animals and humans creates opportunities for spreading of
zoonotic diseases. The present study was performed on 17 apparently healthy, nondiarrheic Dorcas gazelles (Gazella Dorcas) which inhabits Giza Zoo. The animals were
bacteriologically examined at different seasons of the year. The study reveals that, E.
coli is the dominant Enterobacteriaceae member following by Klebsiella then
Salmonella. E. coli and Salmonella isolates were subjected to molecular identification
and antimicrobial sensitivity test. E. coli isolates showed high resistance to
erythromycin (100%), tetracycline (100%), cephradin and ceftazidime (92%) and
clindamycin (84%). Salmonella isolates were highly resistance to erythromycin (100%),
clindamycin (100%), cephradin (100%), tetracycline (100%) and cefaclor (100%). The
detection of antibiotic resistant genes confirmed the presence of blaCTX-M and tetA in
all isolates of E. coli and Salmonella. To our knowledge this is the first study which
reports the fecal shedding of Salmonella from Dorcas gazelles.