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Methicillin-resistant Staphylococcus aureus in human milk.

F R Novak1, J A Almeida, M B Warnken

  • 1Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21949-900, Brasil. novak@iff.fiocruz.br

Memorias Do Instituto Oswaldo Cruz
|February 3, 2000
PubMed
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Methicillin-resistant Staphylococcus aureus (MRSA) was detected in human milk samples. Two strains produced enterotoxin B, highlighting the need for hygiene and proper milk storage to prevent bacterial growth.

Area of Science:

  • Microbiology
  • Food Safety
  • Public Health

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen.
  • Human milk can be a vehicle for bacterial transmission.
  • Enterotoxin production by S. aureus in milk poses a health risk.

Purpose of the Study:

  • To detect MRSA strains producing enterotoxins in human milk from Brazil.
  • To investigate the prevalence of the mecA gene in S. aureus isolates.
  • To assess the enterotoxin production and growth potential of MRSA in human milk.

Main Methods:

  • Collection and analysis of 500 human milk samples from five Brazilian cities.
  • Molecular detection of the mecA gene in S. aureus isolates.
  • ELISA or similar assay for enterotoxin detection and bacterial growth studies.

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Main Results:

  • 57 strains of MRSA were identified, with the mecA gene confirmed in all.
  • Two MRSA strains produced enterotoxin B.
  • Significant bacterial growth and enterotoxin release were observed in human colostrum and culture media within 5 hours.

Conclusions:

  • MRSA is present in human milk, with potential for enterotoxin production.
  • Hygiene and proper milk preservation are crucial to minimize S. aureus proliferation.
  • Public health interventions are needed to ensure milk safety.