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We tested the hypothesis that experimental Proteus mirabilis urinary tract infection in mice would protect against homologous bladder rechallenge. Despite production of serum immunoglobulin G (IgG) and IgM (median titers of 1:320 and 1:80, respectively), vaccinated (infected and antibiotic-cured) mice did not show a decrease in mortality upon rechallenge; the survivors experienced only modest protection from infection (mean log(10) number of CFU of P. mirabilis Nal(r) HI4320 per milliliter or gram in vaccinated mice versus sham-vaccinated mice: urine, 100-fold less [3.5 versus 5.5; P = 0.13]; bladder, 100-fold less [3.1 versus 5.1; P = 0.066]; kidneys, 40-fold less [2.7 versus 4.3; P = 0.016]). Western blots using protein from the wild-type strain and isogenic mutants demonstrated antibody responses to MR/P and PMF fimbriae and flagella. There was no correlation between serum IgG or IgM levels and protection from mortality or infection. There was a trend toward elevated serum IgA titers and protection from subsequent challenge (P &gt;/= 0.09), although only a few mice developed significant serum IgA levels. We conclude that prior infection with P. mirabilis does not protect significantly against homologous challenge.

infection and immunity

Serum Immunoglobulin Response and Protection from Homologous Challenge by <i>Proteus mirabilis</i> in a Mouse Model of Ascending Urinary Tract Infection

Serum Immunoglobulin Response and Protection from Homologous Challenge by Proteus mirabilis in a Mouse Model of Ascending Urinary Tract Infection