uMMAi{\' \\'c nave isolated three phages of Fibi'10 paidh"cmob, 11'ct, s from different sourres and investigated some of their properties.The phages \\, ere named v6, v12 and \, 14The phages are different in PIaque morphology, host range, phage yield and serological character.Physical and chemical studies showed that v12 and v14 phages are ITormal in many characters tested but v6 is abnormal.The high \, is cosit of the concentrated preparation, the high sensitivity to sonication and the 10\\, densit of \, 6 phage suggested that it is filamentous.This suggestjolt was confirmed b , preliminary electroi\ microscopy