en Biological Sciences Biological Sciences Original Research Original Research Serovars of Lisreria l1Iollocyrogelles were determined. Sera of aborted samples (200) were collected from different hospitals in Tehran and were tested serologically by immunofluorescent antibody methods (IF tests). 137 positive sera were identified. Positive sera were tested against 12 serovars of Listeria l1Iollocytogelles separately. Titers of antibody in patients' sera for all serovars were determined. The results showed that the dominant serovars of L.l1Iollocyrogelles which caused listeriosis in the samples were 4b, la, 2 and 3. None of the sera had antibodies against serovars 4a, oa or (ib. Some of the sera which had high titers of antibody against dominant serovars (4b, I a, 2 and 3), showed a faint result with serovars 4d, 4e,5 and 7. 173 175 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-580&slc_lang=en&sid=1 SAEED MIRDAMADI 20031947532846006031 20031947532846006031 Yes From the Biochemistry Department, Iranian Research Organization for Science & Technology (IROST) , P.O. Box: 15815-3538 Tehran, 15819 NASRIN MOAZAMI 20031947532846006032 20031947532846006032 No From the Biochemistry Department, Iranian Research Organization for Science & Technology (IROST) , P.O. Box: 15815-3538 Tehran, 15819 SHAHNAZ RAFIEE TEHRANI 20031947532846006033 20031947532846006033 No the Immunology Department, Tehran University of Medical Sciences, Tehran, I.R. Iran.