Abstract
The serum titres of IgG and IgM antibodies to lipid A were measured in 24 children with chronic pyelonephritis (PN), 55 with recurrent lower urinary tract infections (LUTI), 13 with gram-negative sepsis (S), and in 50 control children using an enzyme-linked immunosorbent assay (ELISA). Children ranged in age from 1 month-17 years. Patients with PN were differentiated by the presence or absence of an acute infectious episode and/or vesico-ureteric reflux (VUR). During an acute episode in PN and LUTI, IgG titres were significantly higher than in controls, but only PN patients with an acute infectious episode also had significantly elevated IgM titres. Overall, children with LUTI showed a significantly lower frequency of detectable IgG lipid A antibodies (27%) than in PN (63%). In PN children with VUR not accompanied by an infectious episode, lipid A antibody was found at relatively low titres, while an episode not accompanied by VUR displayed significantly elevated IgG titres, and an episode accompanied by VUR showed elevation of both IgG and IgM anti-lipid A antibody titres.
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