A new scheme for additional typing of P. aeruginosa using antisera prepared against glycopolypeptide derived from the slime of the microorganisms.

The author used the slide agglutination with antisera prepared against glycopolypeptides (GP) derived from the slime of the P. aeruginosa mucoid strains to classify one hundred and nine P. aeruginosa strains in three homogeneous groups. Seventy three per cent were agglutinated by only one of the two initial GP a or b, seventeen percent by both of them and ten per cent remained unagglutinated by these sera. The classification that was described here was demonstrated to be independent from the previously described ones related to protective properties and specific of bactericidal activity of macrophages.