In   order  to  survey  epidemiological  characteristics   of   Salmonellosis  in     

   Hamadan city , a cross - sectional study was made on patients with  positive    

   cultures of Salmonella species.

     A   total   of   318   Salmonella   species  was  collected from eight medical

   centers    from Feb 1993 to May 1997. Different serotypes  were  identified  in

   microbiology    laboratory of the School of   Medicine.  The   data   including

   age, and sex, etc.    were gathered through a  questionnaire  and   analyzed

   using ‘’Epi6’’ system.

     Of 318 Salmonella species isolated , the most  frequent  serotypes   were  S.     

   typhi 44.4% followed  by   S. typhimurium   18.6% . The   frequency   of   other     

   serotypes were as follows :

     S. para B 8.4%, S. para C 6.9% , S. enteritidis 4.8% , S. para A 4.4% , S. species

   4.1% , S. choleraesuis 2.8%, S. agona 2.2% , S. arizona 1.9% , S. infantis 0.6% , S.

   havana , S. lexington and S. virchow each 0.3%. The highest  rate of isolation

   was from   blood   culture   (54.7%)   and  the  lowest  rate was from CSF and

   pleural fluid culture (0.3%).

     The results showed that the predominant serotypes were S. typhi   followed     

   by S. typhimurium in Hamadan city. There was significant relation   between     

   sex and age groups of the typhoidal and non - typhoidal patients.