Keywords
Enterobacter sakazakii
ISO/TS 22964
2006
PCR
phenotypic characterization
How to Cite
Abstract
Cronobacter, formerly known as Enterobacter sakazakii, is a novel genus of the Enterobacteriaceae family recognized as a cause of high number of fatal cases in neonates, after consuming infant formula. The conventional methods for detecting these organisms are time-consuming and lack sensitivity. The ISO/TS 22964:2006 is the most recently standardized methodology for detecting Cronobacter in powdered infant formula. This study aimed at confirming the Brazilian isolates previously identified as E. sakazakii as Cronobacter spp. by biochemical assays, and also to compare characteristics of 37 Cronobacter and non-Cronobacter isolates; and the miniaturized kits and the ISO/TS methodology were evaluated. A conventional PCR protocol targeting dnaG was also developed and a previously described gluA targeting protocol was used. The majority of the Brazilian isolates were not confirmed as Cronobacter spp., and the selective enrichment step of ISO/TS methodology was inhibitory to some Cronobacter strains. The ID 32E was the most reliable kit. The PCR protocol targeting gluA showed consistent results with ID 32E and the developed dnaG PCR protocol was 100% sensitive and specific. Thus, the PCR protocols targeting gluA and dnaG might be used to complement the Cronobacter spp. detection or identification after performing the conventional isolation and identification methods.References
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