[A complementary phage-typing scheme for "P. aeruginosa" (author's transl)].

Twenty per cent of Pseudomonas aeruginosa strains isolated in Portugal are non typable with the phage-typing Lindberg system, but most of them may be typed with the aid of a new phage-typing method. This complementary scheme of phage-typing is based on the use of 15 new phages from sewage; 39 phage-types were found among a group of the non-typable strains isolated in several hospitals in Lisbonne. The relations between the serotypes, the pyocinotypes and the new lysotypes are investigated.