Summary
A slide agglutination test to detect P-fimbriatedEscherichia coli was developed by attaching glycosides containing the relevant receptor structure (α-D-Galp-(1–4)-β-D-Galp) to particles. A suspension of these particles agglutinates within ten seconds when mixed with P-fimbriated bacteria. The test is named the P-specific particle agglutination test (PPA test). The PPA test is more sensitive than the haemagglutination assays previously used. The exclusive specificity of the PPA test also allows the detection of P-fimbriae on strains which additionally possess other fimbriae (e. g. X-fimbriae). Using this test, the frequency of P-fimbriatedE. coli in children with acute non-obstructive pyelonephritis was shown to exceed 95%. In lower urinary tract infections the frequency of P-fimbriatedE. coli was approximately 20%. Moreover, children with acute pyelonephritis were also found to be heavily colonized in both the periurethral area and the intestine with the identical P-fimbriatedE. coli strain.
Zusammenfassung
Für den Nachweis P-Fimbrien tragenderEscherichia coli wurde ein Objektträger-Agglutinationstest entwikkelt, bei dem Partikel-gebundene Glykoside mit der entscheidenden Rezeptor-Struktur (α-D-Galp-(1–4)-β-D-Galp) verwendet werden. Wird eine Suspension dieser Partikel mit P-Fimbrien tragenden Bakterien vermischt, so kommt es innerhalb von zehn Sekunden zur Agglutination. Der Test wird P-spezifischer Partikel-Agglutinationstest (PPA-Test) genannt. Der PPA-Test ist empfindlicher als die früher angewandten Hämagglutinationstests. Wegen seiner exklusiven Spezifität ermöglicht er auch den Nachweis von P-Fimbrien auf Stämmen, die zusätzlich andere Fimbrien tragen (z. B. X-Fimbrien). Mit dem PPA-Test wurden bei mehr als 95% der Kinder mit akuter, nicht obstruktiver Pyelonephritis P-Fimbrien tragendeE. coli nachgewiesen; ihre Häufigkeit bei Infektionen der unteren Harnwege lag bei etwa 20%. Außerdem fand sich bei Kindern mit akuter Pyelonephritis eine starke Kolonisation der periurethralen Region und des Darmes durch mit dem pathogenen Erreger identische, P-Fimbrien tragendeE. coli.
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Möllby, R., Källenius, G., Svenson, S.B. et al. P-fimbriae of pyelonephritogenic Escherichia coli: Detection in clinical material by a rapid receptor-specific agglutination test. Infection 11, 68–72 (1983). https://doi.org/10.1007/BF01651363
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DOI: https://doi.org/10.1007/BF01651363