A NEW BACTERIOPHAGE ACTIVE AGAINST A LACTIC STREPTOCOCCUS

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Abstract
Ten races of bacteriophage active against strains of Streptococcus cremoris and one race active against S. lactis have been examined in an electron microscope. Nine of the 1st group and the 1 in the 2d group are morphologically similar to one another and to those reported by others as active against S. lactis. The remaining strain is different in size and shape. It has a spherical head, 70-80 m[mu]. in diameter, consisting of a cell wall filled with opaque material. This is attached to a long flagellum-like tail 15 m[mu]. wide and 560 to 610 m[mu]. long that is a single fibril. The over-all length exceeds that of bacteriophages so far reported.