PubMed · 61447
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1976-10-09. Haemophilus influenzae.. https://pubmed.ncbi.nlm.nih.gov/61447/
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Eikenella corrodens is a gram-negative, facultative anaerobic bacillus with specific culture and growth requirements and unusual antibacterial susceptibilities. It has only recently been recognized as a human pathogen. Ocular and adnexal infections with this organism are rare especially in children. We treated two children with orbital cellulitis caused by E. corrodens. One was an 8-year-old boy; the other was an 11-year-old girl. Orbital cellulitis in both patients occurred after an upper respiratory tract infection. Sinusitis and a subperiosteal abscess were present in both patients. Eikenella corrodens and Streptococcus viridans were isolated from the boy; E. corrodens was the sole isolate in the girl. Intravenous ampicillin, prolonged hospitalization, and surgical drainage of the orbit were required to control the infection in both patients. Eikenella corrodens must be considered in the differential diagnosis of orbital cellulitis in children, and ophthalmologists must become familiar with the characteristics of this peculiar organism.
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Anodic stripping voltammetry of bacterial growth medium containing copper(II) and ampicillin shows that Cu(II) is complexed by the antibiotic and that this complex decomposes to give Cu(II) complexes with ligands derived from ampicillin. At pH 7, substantial decomposition of ampicillin occurs over a few minutes, and even the very low levels of Cu(II) in Chelex-extracted medium are able effectively to catalyse the decomposition. The significance of this observation was shown during the screening of an Escherichia coli cosmid library for clones exhibiting increased resistance to Zn(II), Co(II) or Cd(II); the unexpected growth of the ampicillin-sensitive host E. coli strain on Luria-Bertani plates containing ampicillin and any of these metals was attributed to metal ion-catalysed decomposition of ampicillin. The instability of ampicillin (and other beta-lactam antibiotics) to metal ion-catalysed hydrolysis means that great care must be taken to ensure that such reactions do not occur in growth media. Furthermore, it is clear that double selection for resistance to ampicillin and metals such as Cu(II), Zn(II), Co(II) and Cd(II) is impossible.