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Applied and Environmental Microbiology
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General Microbial Ecology

Serogrouping of Halophilic Bdellovibrios from Chesapeake Bay and Environs by Immunodiffusion and Immunoelectrophoresis

Andrew J. Schoeffield, William A. Falkler Jr., Darshana Desai, Henry N. Williams
Andrew J. Schoeffield
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William A. Falkler Jr.
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Darshana Desai
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Henry N. Williams
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ABSTRACT

Little has been reported on the serological relationship of halophilic bdellovibrios (Bd). Immunodiffusion analysis performed with rabbit or mouse Bd antisera developed against eight halophilic Bd isolates and one terrestrial Bd isolate, when reacted with soluble antigen preparations of 45 isolates of halophilic Bd, allowed separation into seven serogroups, which were distinct from the terrestrial isolate. Soluble antigen preparations of prey bacteria, Vibrio parahaemolyticus P-5 (P-5) and Escherichia coli ML 35 (ML 35), exhibited no reactivity with the antisera by immunodiffusion. Immunoelectrophoresis revealed the presence of three distinct antigens in homologous reactions and one shared antigen in heterologous Bd reactions. Shared antigens were noted between halophilic and terrestrial Bd, in addition to between halophilic Bd strains, indicating the possible existence of an antigen(s) which may be shared among all Bd. Again, no shared antigen was noted when P-5 or ML 35 was allowed by immunoelectrophoresis to react with the antisera. Prey susceptibility testing of the seven distinct groups of halophilic Bd, using 20 test prey, produced essentially identical spectra for each group, indicating that this was not a useful technique in delineating the Bd. While immunoelectrophoresis was able to demonstrate an antigen common to all Bd tested, immunodiffusion was able to delineate strains on the basis of a “serogroup specific” antigen. This suggests that immunological tools may serve as important means to study the taxonomy of halophilic Bd, as well as in the formation of a clearer taxonomic picture of the genus Bdellovibrio.

FOOTNOTES

  • ↵* Corresponding author.

  • Copyright © 1991, American Society for Microbiology
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Serogrouping of Halophilic Bdellovibrios from Chesapeake Bay and Environs by Immunodiffusion and Immunoelectrophoresis
Andrew J. Schoeffield, William A. Falkler Jr., Darshana Desai, Henry N. Williams
Applied and Environmental Microbiology Dec 1991, 57 (12) 3470-3475; DOI:

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Serogrouping of Halophilic Bdellovibrios from Chesapeake Bay and Environs by Immunodiffusion and Immunoelectrophoresis
Andrew J. Schoeffield, William A. Falkler Jr., Darshana Desai, Henry N. Williams
Applied and Environmental Microbiology Dec 1991, 57 (12) 3470-3475; DOI:
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