RT Journal Article SR Electronic T1 Killing of Escherichia coli by human polymorphonuclear leucocytes in the presence of Bacteroides fragilis. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 86 OP 91 DO 10.1136/jcp.38.1.86 VO 38 IS 1 A1 W A Vel A1 F Namavar A1 A M Verweij-van Vught A1 A N Pubben A1 D M MacLaren YR 1985 UL http://jcp.bmj.com/content/38/1/86.abstract AB The inhibitory effect of Bacteroides fragilis on the in vitro killing of Escherichia coli by polymorphonuclear leucocytes was studied with two pairs of E coli and B fragilis isolated from human wound infections. Both B fragilis strains behaved similarly: they inhibited the killing of one E coli strain, while the killing of the other E coli strain was not affected. The different behaviour of the two E coli strains depended on their need for fresh serum in the killing by the polymorphonuclear leucocytes. The inhibitory effect of the B fragilis strains could be completely accounted for by their effect on complement.