Description:
<jats:p>1. Two principal types of gonococci may be recognized by suitable immunological tests; e. g., agglutination and complement fixation. These two types correspond to the adult and infant types of infection with the gonococcus, seen clinically.</jats:p>
<jats:p>2. On the basis of the immunological reactions of agglutination and complement fixation the strains of gonococci isolated from three cases of ophthalmia are classed with the adult type.</jats:p>
<jats:p>3. A polyvalent antigen for the serological diagnosis of a gonococcus infection should represent strains of the infant type of organism in order that both types of infection, infant as well as adult, may be recognized.</jats:p>