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2′,5′-Oligoadenylate Synthetase and Interferon in Peripheral Blood after Rubella, Measles, or Mumps Live Virus Vaccine

Abstract The temporal activation of the human interferon system by infection with virus was studied by serial measurements of both interferon in serum and activity of 2′,5′-oligo adenylate synthetase in peripheral mononuclear leukocytes. A frequency distribution of baseline values of synthetase was established for normal individuals. Following subcutaneous inoculation of rubella vaccine virus, serum interferon rose briefly with a peak on Day 14. The peak concentration of synthetase also occurred on Day 14 but remained elevated for greater than 1 week. After measles virus, serum interferon did not rise above baseline, but synthetase peaked on Day 14 and remained elevated. Subcutaneous inoculation of mumps vaccine virus was associated with a brief period of elevation of the synthetase and no interferon in the serum. Thus, the determination of synthetase levels in tissue may be useful in some situations to reflect a small or transient elevation of endogenous interferon.