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Pyelonephritis. XIX. Immunization against enterococcal pyelonephritis

L B Guze, J Z Montgomerie, H J Harwick

    Investigative Urology
    |July 1, 1976
    PubMed
    Summary

    Immunization against Streptococcus faecalis pyelonephritis in rats offered limited protection when administered intravenously or subcutaneously, with no correlation to antibody levels or serum bactericidal activity.

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    Area of Science:

    • Microbiology
    • Immunology
    • Nephrology

    Background:

    • Streptococcus faecalis is a common cause of urinary tract infections.
    • Pyelonephritis, an infection of the kidney, can lead to serious complications.
    • Developing effective immunization strategies is crucial for preventing kidney infections.

    Purpose of the Study:

    • To investigate the efficacy of different immunization routes against Streptococcus faecalis-induced pyelonephritis in a rat model.
    • To explore the correlation between immunization, antibody response, and protection against infection.
    • To assess the impact of immunization and infection on serum bactericidal activity.

    Main Methods:

    • Rats were immunized via intravenous, subcutaneous, or bladder routes using Streptococcus faecalis.
    • Animals were challenged intravenously or retrogradely with both logarithmic and stationary growth phase organisms.
    • Circulating antibody levels and serum bactericidal activity were measured.

    Main Results:

    • Incomplete protection was observed only in rats immunized intravenously or subcutaneously and challenged intravenously with log phase organisms.
    • No significant correlation was found between circulating antibody response and the level of infection.
    • Neither immunization nor infection led to increased serum bactericidal activity.

    Conclusions:

    • Intravenous and subcutaneous immunization provided minimal protection against Streptococcus faecalis pyelonephritis in rats.
    • Circulating antibody levels and serum bactericidal activity are not reliable indicators of protection in this model.
    • Further research is needed to develop more effective immunization strategies for preventing Streptococcus faecalis kidney infections.

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