THE DISTRIBUTION OF "T" AGGLUTININS IN HUMAN SERA.

A survey has been made of the titres of "T" agglutinins in human sera from individuals of various ages. There is no "T" agglutinin in umbilical cord serum, the agent develops normally during the first year of life and after the age of three the titres are not significantly different from those of adults. Sera from cases of atypical pneumonia with cold agglutinins are significantly higher in "T" agglutinins than normal sera. "T" agglutinins and cold agglutinins in these sera are distinct. There is no significant alteration in the "T" agglutinin titre of sera from cases of mumps, influenza, psittacosis and hepatitis. [ABSTRACT FROM AUTHOR]