A novel technique, based on cytotoxicity-neutralization, was developed for the in vitro titration of anti-sheep lymphocyte and anti-sheep macrophage sera. The titres obtained for a number of antisera were compared with those found in an agglutination assay. Anti-lymphocyte sera with a high cytotoxicity-neutralization titre very effectively suppressed the number of circulating lymphocytes the peripheral blood of treated new-born lambs, thus indicating in vivo immunosuppressive activity.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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