Detection of specific bacterial antigen in urine of patients infected with Bacteroides fragilis.
An indirect enzyme-linked immunosorbent assay was developed to detect specific Bacteroides fragilis antigen(s) in human urine. Specimens collected within 72 hr of a positive culture were centrifuged, dialyzed, and treated with Tween 20, polyethylene glycol, and bovine serum albumin. Goat hyperimmune gamma-globulin to B. fragilis strain ATCC 23745 was added and incubated, and supernatants were tested for antibody activity to polysaccharide-protein antigen of the same organism. Mean +/- SD results, reported as percentage inhibition of control values and interpreted blindly, were as follows: 29 normal subjects, 9.8% +/- 6.0%; 22 patients with Enterobacteriaceae bacteremia, 6.0% +/- 5.1%; six patients with nonbacteremic infections due to B. fragilis, 22.3% +/- 10.3%; and nine patients with B. fragilis bacteremia, 28.7% +/- 10.2%. Three of six nonbacteremic patients and eight of nine bacteremic patients yielded values greater than 2 SD of control values. None of 22 patients with Enterobacteriaceae bacteremia was falsely positive (specificity, 100%).
D000942:Antigens, Bacterial / Q000652:urine*; D001442:Bacteroides Infections / Q000276:immunology / Q000652:urine*; D001441:Bacteroides fragilis / Q000276:immunology*; D004756:Enterobacteriaceae Infections / Q000276:immunology / Q000652:urine; D004797:Enzyme-Linked Immunosorbent Assay; D005189:False Positive Reactions; D006801:Humans; D018805:Sepsis / Q000276:immunology / Q000652:urine
D000942:Antigens, Bacterial