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Chemotherapy. 1996 May-Jun;42(3):206-9.

The in vitro synergistic inhibitory effect of human amniotic fluid and gentamicin on growth of Escherichia coli.

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Department of Pharmacology, University of Padua, Italy.


The activity of serum and its synergistic effect with many antibiotics against bacteria are well known. Few reports are available on similar phenomena produced by human amniotic fluid (HAF). Thus we investigated the antibacterial activity of HAF and the presence of a synergistic effect with gentamicin (GM) against Escherichia coli strains. Antimicrobial activity was evaluated as a delay of the growth curve, using a turbidimetric method. E. coli ATCC 10798 and E. coli SC 12155 were employed as test micro-organisms in nutrient broth, and GM was used at a subinhibitory concentration. HAF exerted antibacterial activity and, cooperating with GM at subinhibitory concentration, enhanced its antibiotic activity against E. coli. The presence of Schlievert's glycoprotein in HAF could explain these results.

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