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Coates, Helen V. (National Institute of Allergy and Infectious Diseases, Bethesda, Md.),Ben R. Forsyth, and R. M. Chanock . Biophysical studies of respiratory syncytial virus. I. Density of respiratory syncytial virus and associated complement-fixing antigens in a cesium chloride density gradient. J. Bacteriol.91: 1263–1269. 1966.—Concentrated fluids from respiratory syncytial (RS) virus-infected tissue cultures (HEp-2 and BEK) were subjected to equilibrium sedimentation in cesium chloride. When two antigenically distinct strains of RS virus (Long and 18537) were tested, approximately 90% of the infectious virus was recovered in a sharp, symmetrical peak with a density of 1.22 to 1.24. In a similar study, unconcentrated virus had a density of 1.25 to 1.27. Two immunologically distinguishable complement-fixing antigens (antigens A and B) were detected at densities of 1.28 to 1.32 and 1.23 to 1.37. In addition, the existence of a third antigen (density of 1.22 to 1.30) was suggested. The possible origin of these antigens is discussed relative to the known properties of RS virus and the other myxoviruses.

journal of bacteriology

Biophysical Studies of Respiratory Syncytial Virus I. Density of Respiratory Syncytial Virus and Associated Complement-Fixing Antigens in a Cesium Chloride Density Gradient