Classification of the bacteriophages of Gram-positive cocci: Micrococcus, Staphylococcus, and Streptococcus.

Micrococcus, Staphylococcus, and Streptococcus phages are classified by morphology, serological properties and physical and chemical parameters of the virion and its nucleic acid. Fourteen species are defined; they include 75 tailed phages belonging to 6 morphological groups. Type species are proposed. Three species seem to have phylogenetic relationships with Bacillus phages.