In the Weil-Felix test, sera from patients infected with Orientia tsutsugamushi reacted with lipopolysaccharide (LPS) from Proteus mirabilis OXK strains. The O-polysaccharide of P. mirabilis OXK LPS consisted of pentasaccharide repeating units, with amidically-linked lysine residues. The lysine,
Sugar analysis and 1H- and 13C-NMR spectroscopic studies showed that various strains of Proteus mirabilis OXK used as antigens in the Weil-Felix test for serodiagnosis of rickettsiosis (scrub typhus) produce lipopolysaccharides (LPSs) with the same O-specific polysaccharide chain having the
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