»Mumps Skin Test Antigen conforms to the regulations of the FDAconcerning biologics (see
Biologics á1041ñ).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 20complement-fixing units in each mL.It contains approximately 0.006
Mglycine as a stabilizing agent,and it contains a preservative.