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Comparison between bacteriophage typing and serotyping for the differentiation of Bacillus sphaericus strains.

Eleven bacteriophages were isolated using mosquito pathogenic strains of B. sphaericus as hosts. The phage morphology and host range on five DNA homology groups including 16 mosquito pathogenic and 32 non-pathogenic strains were determined. the same bacterial strains were studied serologically for their flagellar agglutination by antisera representing eight serotypes: six antisera prepared against the reference strains for the DNA homology groups and two others against selected mosquito pathogenic strains. Two new serotypes have been determined among the non-pathogenic strains. Both phage typing and serotyping identified subgroups within the IIA homology group which contains the mosquito pathogens. The same bacterial strains were found in the subgroups established by both methods. These subgroups often paralleled difference in the level of toxicity of the strains for mosquito larvae.

Bacillus↗
PubMed1998

A new bacteriophage typing scheme for Proteus mirabilis and Proteus vulgaris strains. 3. Analysis of lytic properties.

The lytic properties of 21 bacteriophages constituting a new typing set for Proteus were examined in 507 Proteus mirabilis and 29 P. vulgaris strains isolated from patients and healthy subjects. Comparison of their morphological, serological, genetic and lytic properties showed that, in the Myoviridae and Podoviridae families, some phages were so closely related that the presence of all of them in the set was redundant. Analysis of the lytic properties revealed that some of the bacteriophages were not active enough to facilitate the differentiation of Proteus strains. The size of the final typing set was reduced from 21 to 12 phages but it was suggested that, in order to improve the differentiation capacity of the set, new phages should be included.

Bacteriophage Typing↗