NDLI: Microbiology of raw milk in New Zealand.

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Microbiology of raw milk in New Zealand.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hill, Bruce Smythe, Betty Lindsay, Denise Shepherd, Joanna
Spatial Coverage	New Zealand
Description	Country affiliation: New Zealand Author Affiliation: Hill B ( Fonterra Research Centre, Fitzherbert Science Centres, Palmerston North, New Zealand. bruce.hill@fonterra.com)
Abstract	The results of this study demonstrate the occurrence of the non-spore-forming pathogens, Staphylococcus aureus, Escherichia coli (total count and O157:H7), Listeria, Campylobacter and Salmonella, in New Zealand's raw milk supply. Samples of raw milk were collected monthly within five major dairying regions over one year. Each month, samples from five randomly selected farm vats in each region were collected for analysis (297 samples in total). Methods based on plate count techniques were used to enumerate S. aureus and E. coli. Enrichment methods in combination with a modified most probable number detection method were used to monitor samples for the presence of E. coli O157:H7, Listeria, Campylobacter and Salmonella. Salmonella was not detected in this study, and Campylobacter was isolated once (0.34%). E. coli was present at <100 cfu/ml in 99% of samples and exceeded 10(3)cfu/ml in 0.7% of samples. E. coli O157:H7 was not detected whereas non-pathogenic E. coli O157 strains (i.e. lacking genes for stx1, stx2, eae and Hly A) were detected in 1% of samples. S. aureus was not detected (<1 cfu/ml) in 21% of samples; levels were >1 but <100 cfu/ml in 60% of samples and on one occasion (0.34%) S. aureus exceeded 10(4)cfu/ml. L. monocytogenes was isolated from 0.68% of samples and L. innocua was present in 4% of samples. The results demonstrate that raw milk sampled from farm vats in New Zealand, as in other countries, inevitably contains recognised pathogens and, hence, control by pasteurisation or an equivalent treatment of raw milk remains paramount. Even so, the prevalence of most of these pathogens was lower than those reported in many of the studies performed in other countries.
File Format	HTM / HTML
ISSN	01681605
Issue Number	2
Volume Number	157
e-ISSN	18793460
Journal	International Journal of Food Microbiology
Language	English
Publisher	Elsevier
Publisher Date	2012-07-02
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Escherichia Coli O157 Salmonella Discipline Microbiology Microbiology Isolation & Purification Pasteurization Listeria Monocytogenes Colony Count, Microbial Food Microbiology Journal Article New Zealand Animals Escherichia Coli Listeria Dairying Bacteria Genetics Staphylococcus Aureus Discipline Nutritional Sciences Milk
Content Type	Text
Resource Type	Article
Subject	Medicine Microbiology Safety, Risk, Reliability and Quality Food Science

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Microbiology of raw milk in New Zealand.

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