A Capsulate Staphylococcus Aureus Scott, A. C.,, 2, 253-260 (1969), doi = https://doi.org/10.1099/00222615-2-3-253, publicationName = Microbiology Society, issn = 0022-2615, abstract= SUMMARY A capsulate staphylococcus designated strain M is described. Apart from the presence of a capsule, this strain has most of the biological properties of typical strains of Staphylococcus aureus. Strain M differs from modal strains of S. aureus in its colonial morphology, resistance to bacteriophage, greater virulence for mice and failure to clump in plasma. These differences are attributed to the presence of a thick capsule. Non-capsulate variants, produced by prolonged culture in nutrient broth, were indistinguishable from typical strains of S. aureus, but reverted to the parent capsulate form when passaged in mice. Strain M is compared with three heavily capsulate strains previously described, and with staphylococcus strain “ Smith ”, and the “ Smith-like ” strains of S. aureus. The capsulate strain M has been deposited in the National Collection of Type Cultures (no. 10649)., language=, type=