DQ195252 (10). This was in agreement with many
reports that indicated that ORT strains from all over
the world were closely related clones (1,14).
The high similarity of biochemical reactions and
great homology between our isolates with the isolates
(all without any correlation with serotyping results)
of other regions all over the world from several bird
species support the suggestion of Canal et al. (13), in
which ORT has only recently been introduced from a
common source. Therefore, most disease episodes in
domesticated poultry could have resulted from
infection with a single clone complex even from wild
bird populations (14). Such homology between the
isolates demonstrates that vaccination could be a
successful strategy for the control of this disease in
poultry flocks.
M. HASSANZADEH, V. KARRIMI, N. FALLAH, I. ASHRAFI
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