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Updated: Aug 17, 2026

Super-resolution Imaging of Proteus mirabilis Biofilm by Expansion Microscopy
Published on: July 18, 2025
First description of DHA-1 ampCbeta-lactamase in Proteus mirabilis
1Laboratoire d'Etudes de Génétique Bactérienne dans les Infections de l'Enfant (EA 3105), Université Denis Diderot-Paris VII, Service de Microbiologie, Hôpital Robert Debré, Paris, France. philippe.bidet@rdb.ap-hop-paris.fr
Abstract:
This report describes the first occurrence of the DHA-1 ampCbeta-lactamase gene in Proteus mirabilis. The organism was isolated from the vaginal flora of a pregnant woman in a French hospital. The DHA-1 beta-lactamase gene was identified on the basis of phenotypic characteristics, PCR amplification and sequencing. Antagonism between cefoxitin and the other cephalosporins suggested inducible production of the DHA-1 enzyme.
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