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  • Title: Host susceptibility and clinical outcomes in toll-like receptor 5-deficient patients with typhoid fever in Vietnam.
    Author: Dunstan SJ, Hawn TR, Hue NT, Parry CP, Ho VA, Vinh H, Diep TS, House D, Wain J, Aderem A, Hien TT, Farrar JJ.
    Journal: J Infect Dis; 2005 Apr 01; 191(7):1068-71. PubMed ID: 15747241.
    Abstract:
    Toll-like receptor 5 (TLR5) mediates innate immune responses to bacterial pathogens by binding to flagellin. A polymorphism in the TLR5 gene introduces a premature stop codon (TLR5(392STOP)) that is associated with susceptibility to legionnaires disease. Here we investigated whether TLR5(392STOP) was associated with typhoid fever. The frequency of TLR5(392STOP) was not significantly different in 565 patients with typhoid fever and 281 ethnically matched control subjects. Furthermore, TLR5 deficiency had no measurable effect on a number of clinical parameters associated with typhoid fever, including fever clearance time, pathogen burden, disease severity, or age at acquisition of disease. TLR5 may not play an important role in TLR-stimulated innate immune responses to human infection with Salmonella enterica serovar Typhi. Initiation of these responses may rely on other TLRs that recognize different bacterial ligands.
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