Abstract
Conclusions
Both placental and plasma gamma globulins contain Lansing antibody. The 50% neutralizing titer of these products is approximately 10-3.5, as determined in mice. It would seem that a more potent gamma globulin could be obtained if prospective donors were first tested for serum Lansing antibody level. Then only those with high levels would be used to furnish plasma for the pools to be fractionated. Placental and plasma gamma globulins have a significant sparing effect when inoculated in mice 24 hours before a cerebral challenge of Lansing virus.
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