Serological characterization of Proteus penneri species novum.

Serological characterization of the first collection of the 20 Proteus penneri strains is presented. All anti-0 sera were examined in microagglutination, semi-quantitative precipitation and passive hemagglutination tests. Some P. penneri lipopolysaccharides showed strong cross-reactivity in passive hemagglutination additionally confirmed by inhibition in this test. Serological similarity between species within genus Proteus is discussed.