Antimicrobial resistance in Gram-negative bacilli isolated from infant formulas

A total of 90 samples of infant formula (IF) were collected from the lactary of a teaching hospital, during a 4-month period from July to August 1999. The sanitary conditions of the formulas were analyzed, and a physiological characterization of Gram-negative bacillus isolates and antimicrobial susc...

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Bibliographic Details
Published in:FEMS microbiology letters 2003-11, Vol.228 (2), p.175-179
Main Authors: Letícia AM Carneiro, Silva, Ana PS, Merquior, Vânia LC, Queiroz, Mara LP
Format: Article
Language:English
Subjects:
Amoxicillin
Ampicillin
Antiinfectives and antibacterials
Antimicrobial agents
Antimicrobial resistance
Baby foods
Bacilli
Cefoxitin
Citrobacter
Clavulanic acid
Coliforms
Contamination
Enterobacter cloacae
Gram-negative bacilli
Infant formulas
Infants
Klebsiella
Klebsiella pneumoniae
Microbiology
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Summary:A total of 90 samples of infant formula (IF) were collected from the lactary of a teaching hospital, during a 4-month period from July to August 1999. The sanitary conditions of the formulas were analyzed, and a physiological characterization of Gram-negative bacillus isolates and antimicrobial susceptibility testing were performed. Colony counts were considered to be unacceptable for the majority of the IF samples and the contamination rates were related to inadequate handling. Coliforms (35°C and 45°C growth) were detected in most of the IF tested. Klebsiella pneumoniae, Citrobacter freundii, Cedacea davisae, Klebsiella planticola and Enterobacter cloacae were the isolates most commonly identified. Antimicrobial susceptibility testing showed significant resistance rates, particularly to amoxicillin/clavulanic acid, cefoxitin, cephalotin or ampicillin. One extended-spectrum β-lactamase-producing K. pneumoniae strain was also recovered.
ISSN:0378-1097
1574-6968
DOI:10.1016/S0378-10970300739-0