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Milk product safety and household food hygiene influence bacterial contamination of infant food in peri-urban Kenya

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Title Milk product safety and household food hygiene influence bacterial contamination of infant food in peri-urban Kenya
 
Creator Hoffmann, Vivian
Simiyu, S.
Sewell, D.K.
Tsai, K.
Cumming, O.
Mumma, J.
Baker, K.K.
 
Subject food safety
animal products
dairying
health
 
Description Background: Milk is a common infant food in peri-urban Kenya that can transmit diarrhea-causing enteric pathogens. Little is known about how contamination of milk at point of purchase and household handling of milk-based infant foods contribute to infant exposure to enteric pathogens.

Objective: To compare the prevalence and concentrations of bacterial indicator organisms and enteric pathogens in unpackaged, fresh pasteurized, and ultra-high temperature (UHT) treated milk at purchase and assess the influence of the type of milk used to prepare infant food on contamination of this food.

Methods: Paired samples of purchased milk and infant food prepared with this milk were obtained from 188 households in low-income neighborhoods in Kisumu, Kenya. Samples were cultured on selective media to isolate Salmonella enterica, Shigella spp., Klebsiella aerogenes, Proteus spp., and Escherichia coli, with pathogens validated by PCR. Probability of detection of these bacteria was compared by milk product treatment and packaging method, and between milk at point of purchase vs. food at point of infant consumption.

Results: Unpackaged milk was most contaminated at point of purchase, but bacterial contamination was also present in pasteurized and UHT milk at purchase. Presence of bacteria in UHT and fresh pasteurized milk at purchase predicted presence of the same bacteria type in infant food. Prevalence of bacterial contamination and concentration level for bacterial indicators generally increased between point of purchase and consumption in UHT and fresh pasteurized milk-based food but decreased in unpackaged milk-based food. Prevalence of the four fecal bacteria were similar in infant foods prepared with each type of milk.

Conclusion: Both pre-market contamination and post-purchase handling influence the likelihood of infants ingesting foods contaminated by diarrheal pathogens.
 
Date 2022-02-08
2022-12-21T08:16:48Z
2022-12-21T08:16:48Z
 
Type Journal Article
 
Identifier Hoffmann, V., Simiyu, S., Sewell, D.K., Tsai, K., Cumming, O., Mumma, J. and Baker, K.K. 2022. Milk product safety and household food hygiene influence bacterial contamination of infant food in peri-urban Kenya. Frontiers in Public Health 9: 772892.
2296-2565
https://hdl.handle.net/10568/126147
https://doi.org/10.3389/fpubh.2021.772892
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 772892
 
Publisher Frontiers Media
 
Source Frontiers in Public Health