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Staphylococcal Intoxication Traced to Non-Fat Dried Milk

Kamel Raouf El-Dairouty1

  • 1Food Microbiology Department, Central Public Health Laboratories, Ministry of Health, Cairo, Egypt.

Journal of Food Protection
|April 21, 2019
PubMed

Insights

Food poisoning outbreaks in Egypt were linked to imported non-fat dried milk (NDM). Although bacteria were absent, dangerous staphylococcal enterotoxins A and B were detected in NDM samples, confirming contamination.

Area of Science:

  • Food safety
  • Microbiology
  • Toxicology

Background:

  • Food poisoning outbreaks linked to imported non-fat dried milk (NDM) occurred in Egypt in 1986.
  • Contamination of dairy products poses a significant public health risk.

Purpose of the Study:

  • To investigate the microbiological and toxicological profile of non-fat dried milk implicated in food poisoning outbreaks.
  • To identify potential causative agents in contaminated NDM.

Main Methods:

  • Bacteriological examination of NDM samples for common foodborne pathogens.
  • Detection of staphylococcal enterotoxins A and B using immunological methods.

Main Results:

  • All tested NDM samples were free from coagulase-positive staphylococci, Salmonella, Shigella, Bacillus cereus, Clostridium perfringens, and Escherichia coli.
  • Viable bacterial counts were low, ranging from 7.9 × 10^2 to 5.0 × 10^4 cells/g.
  • Staphylococcal enterotoxins B and A were detected in NDM samples from the outbreaks and other representative NDM batches.

Conclusions:

  • The food poisoning outbreaks were attributed to staphylococcal enterotoxins present in the non-fat dried milk, not bacterial contamination.
  • This highlights the risk of toxin-producing bacteria in food products even with low bacterial counts.

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