The immune response in rabbits to tetanus toxoid was followed from 10 to 182 days. It was found that 7S became 500 times more efficient in toxin neutralization (TN) and 11 times greater in haemagglutination (HA) than 19S during this time period. No evidence that 19S inhibited 7S and vice versa by TN or HA was apparent at the concentrations tested. Precipitation in gel of tetanus toxoid was demonstrated only with 7S.
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