Desiccation survival of Acinetobacter spp. in infant formula

Juma, N.A., Manning, G. and Forsythe, S.J. ORCID: 0000-0002-6709-0712, 2016. Desiccation survival of Acinetobacter spp. in infant formula. Food Control, 68, pp. 162-166. ISSN 0956-7135

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Abstract

Acinetobacter spp. are included under category B in the FAO-WHO list of organisms of concern for neonatal health following the consumption of powdered infant formula. However, the ability of Acinetobacter spp. to maintain their viability in desiccated infant formula over a storage period consistent with the shelf-life of commercially available powdered infant formula (2 years) has not been demonstrated. In this study, 9 clinical and food isolates of A. baumannii, A. calcoaceticus, and Acinetobacter genomosp. 3 were desiccated in infant formula and then reconstituted at designated time points. Bacterial viability was followed for a maximum period of 24 months or until the strain became undetectable (<5 x 102 cfu/ml). For comparative purposes, one Enterobacter hormaechei and two Enterobacter cloacae strains were also monitored for their desiccation survival. The seven clinical and food strains remained cultivable for the whole duration of the study and showed biphasic survival curves. The initial drop in viable count was up to 3.5 log10 cfu/ml within 18 h of desiccation exposure. By the end of the study, the reduction in viability was between 3.6 and 4.8 log10 cfu/ml. In contrast the A. baumanii and A. calcoaceticus species type strains only persisted for 6 and 9 months, respectively, possibly due to laboratory adaptation. The E. cloacae and E. hormaecehei strains were undetectable after 12 and 17 months, respectively. The persistence of Acinetobacter spp. strains in desiccated powdered infant formula, supports the FAO-WHO designation of this organism as a risk to neonatal health.

Item Type: Journal article
Publication Title: Food Control
Creators: Juma, N.A., Manning, G. and Forsythe, S.J.
Publisher: Elsevier
Date: October 2016
Volume: 68
ISSN: 0956-7135
Identifiers:
NumberType
10.1016/j.foodcont.2016.03.043DOI
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 05 Apr 2016 10:47
Last Modified: 11 Oct 2017 10:39
URI: http://irep.ntu.ac.uk/id/eprint/27344

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