Mumps Skin Test Antigen

DRUG DESCRIPTION

MSTA®, Mumps Skin Test Antigen, is a sterile suspension of killed mumps
virus for intradermal use. It is prepared from the extraembryonic fluid of the
virus-infected chicken embryo and is concentrated and purified by differential
centrifugation. The virus is killed with formaldehyde solution, 1:1000, and
is then diluted with isotonic sodium chloride solution. The resultant product
contains approximately 0.012 molar glycine and less than 1:8,000 formaldehyde
solution. Thimerosal (mercury derivative) 1:10,000 is added as a preservative.
The skin test antigen is formulated to contain at least 40 complement fixing
units (CFU) per mL, at the time of release, as determined by the Complement-Fixation
Test. This product, after shaking, is slightly opalescent in color.