Morganella morganii: estudio sobre el aislamiento de 192 cepas en el Hospital Nacional de Niños, entre 1995 y 2000

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Abstract

En este estudio retrospectivo, se presenta la experiencia de 192 aislamientos de Morganella morganii, en un periodo de 6 años en el Hospital Nacional de Niños. Se hace énfasis en la frecuencia de aislamiento por muestra clínica y la sensibilidad antibiótico mostrada por este agente.

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Morganella morganii: a newly reported, rare cause of neonatal sepsis.

P N Salen, S Eppes (1997)

This case report reviews the clinical course of an 11-day-old boy who developed late-onset neonatal sepsis secondary to a rare neonatal pathogen, Morganella morganii. This gram-negative enteric bacterium, within the Enterobacteriaceae family, has most commonly been a nosocomial pathogen in debilitated, postsurgical patients. Like many other Enterobacteriaceae, M. morganii has an inducible beta-lactamase and is resistant to multiple antibiotics. When caring for neonates with culture-proven M. morganii sepsis, the authors recommend administering both a third-generation cephalosporin and an aminoglycoside to ensure that both antibiotics are bactericidal and to reduce the induction of resistance.

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Unusual groups of Morganella ("Proteus") morganii isolated from clinical specimens: lysine-positive and ornithine-negative biogroups.

Arnold G. Steigerwalt, Eric Brenner, J J Framer … (1980)

Morganella ("Proteus") morganii is the only species in the recently proposed genus Morganella, but we suspect there are yet undescribed species in the genus. Two candidates for new species were recently investigated. Nineteen strains isolated from clinical specimens resembled M. morganii but were lysine positive and nonmotile and fermented glycerol within 24 h. Typical M. morganii are lysine negative and motile and ferment glycerol slowly or not at all. The three-test variance from typical M. morganii suggested that this new group might be a new Morganella species; however, strains of the group were closely related to typical M. morganii by deoxyribonucleic acid (DNA)-DNA hybridization. A second group of 14 strains isolated from clinical specimens was ornithine negative but was otherwise very similar to M. morganii. This group was also closely related to M. morganii by DNA hybridization. Both sets of strains clearly belong in the species Morganella morganii as distinct biogroups; they are not separate species as originally suspected. Initially both biogroups posed a problem in identification until their true relationship to M. morganii was determined.