Electron microscopic morphology of phages of coagulase-negative staphylococci

Nine phages of coagulase-negative staphylococci were studied carefully with regard to their electron microscopic morphology. Two different groups of phages were detected: the larger phages showed heads of 121 nm diameter on average and tails with 229 nm length and 23 nm width. The smaller phages were characterized with heads of about 76 nm diameter and tails of about 177 nm length and 13 nm width (negatively stained with KPT).