Abstract
The effect of antilymphocytic antibody on the primary immune response to sheep erythrocytes, alum-precipitated bovine serum albumin (BSA), and type III pneumococcus polysaccharide has been investigated in CBA/Ca, C3H/He, and A/HeJ strain mice. This material caused a highly significant suppression of the primary immune response to sheep erythrocytes and BSA in all three mouse strains. Its effect on the primary immune response to type III polysaccharide was less dramatic but, nevertheless, it significantly suppressed this response in CBA mice, indicating that our antilymphocytic antibody preparation did not readily discriminate between thymus-dependent and -independent humoral immune responses in this strain of mice.

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