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Objective: To study blechemichal properties and comparing current
antibiotic resistance of S. abortusovis isolated from sheep in Ch
Bakhtiaiy province and study the prone to R - factor transferability.
Design: Comparative study
Samples: Thirty four strains isolated from Chaharmahal-Bakhtiary .
in 1999-2000
Procedure: Biochemical tests were performed with standard diagnestic
tests, antibiotic susceptibility and it’s transferability were examined.

Results: All strains were resistant to Ampicillin (Am) and
Amoxicillin (Amx). Although the Streptomycin (S) after the Am
and Amx was the most common resistance. Resistance to Amicacin
(AN) and Tetracyclin (Te) were very low (about 2%). All strains ,
were susceptible to Chloramphenicol (C), Nalidixic Acid (Na),
Kanamicin (K) and Enrofloxacin (En). Just in one case the profile
of Am - Amx - Cotrimaxazole (SXT)- AN- Te was developed.
Among the total isolates, 3 cases were able to transfer some part
of their resistance factors. In all three cases only resistance to
Ampicillin were transmitted.
Conclusion: Antibiotic resistance in S. abortusovis strains isolated
from Iran is not that high and rarely were transmited to other
bacteria. This phenomenon may be related to the difficulties
of drug administration in sheep and got flocks.