» Mumps Skin Test Antigen conforms to the regulations of the FDA concerning biologics (see
Biologics 1041). It is a sterile suspension of formaldehyde-inactivated mumps virus prepared from the extra-embryonic fluids of the mumps virus-infected chicken embryo, concentrated and purified by differential centrifugation, and diluted with isotonic sodium chloride solution. It contains not less than 20 complement-fixing units in each mL. It contains approximately 0.006
M glycine as a stabilizing agent, and it contains a preservative.