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S 381and WI-38 cells was determined in a group of 8 seropositive adults with no history of clinical measles. The results showed that lymphocytes from the adults with measles effected as much as a 13% increase in Cr B1 release from WI-M1 as compared to WI-38 cells. The lymphocytes from the two individuals with negative histories showed a much diminished release. These results indicate that the measurement of lymphocytotoxic response may be a useful in vitro method for studying delayed hypersensitivity to measles virus.Absence of serum immunoglobulin E in newborns: Heterogeneity in time of synthesis in infants. MICHAEL BAZARAL, H.

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