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  • 1
    Language: English
    In: The Journal of Infectious Diseases, 1 March 2000, Vol.181(3), pp.1049-1054
    Description: Haemophilus ducreyi expresses a conserved hemoglobin-binding outer-membrane protein (HgbA). To test the role of HgbA in pathogenesis, we infected 9 adults with isolate 35000 and its isogenic hgbA-inactivated mutant (FX504) on their upper arms in a double-blinded, escalating dose-response study. Papules developed at similar rates at sites inoculated with the mutant or parent. The pustule-formation rate was 55% (95% confidence interval [CI], 30.8%-78.5%) at parent sites and 0 (95% CI, 0-10.5%) at mutant sites (P 〈 .0001). The recovery rate of H. ducreyi from surface cultures was 16% (n = 142) from parent sites and 0 (n = 213) from mutant sites (P 〈 .0001). H. ducreyi was recovered at biopsy from 6 of 7 parent sites and from 0 of 3 mutant sites. The results indicate that hemoglobin may be a critical source of heme or iron for the establishment of H. ducreyi infection in humans.
    Keywords: Physical sciences -- Chemistry -- Chemical compounds -- Haemophilus ducreyi ; Biological sciences -- Biology -- Microbiology -- Haemophilus ducreyi ; Biological sciences -- Biology -- Microbiology -- Haemophilus ducreyi ; Health sciences -- Medical conditions -- Infections -- Haemophilus ducreyi ; Physical sciences -- Chemistry -- Chemical compounds -- Haemophilus ducreyi ; Health sciences -- Medical diagnosis -- Diagnostic methods -- Haemophilus ducreyi ; Health sciences -- Medical sciences -- Pharmacology -- Haemophilus ducreyi ; Health sciences -- Medical sciences -- Immunology -- Haemophilus ducreyi ; Health sciences -- Medical conditions -- Physical trauma -- Haemophilus ducreyi ; Health sciences -- Health and wellness -- Public health -- Haemophilus ducreyi
    ISSN: 00221899
    E-ISSN: 15376613
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