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Disinfection methods used in decontamination of bottles used for feeding powdered infant formula
Elizabeth Redmond1, Christopher J Griffith
1Food Research and Consultancy Unit Cardiff School of Health Sciences University of Wales Institute, Cardiff, UK. eredmond@uwic.ac.uk
Insights
Thorough cleaning and disinfection of infant bottles are crucial for preventing infections. Strict adherence to recommended hygiene practices effectively decontaminates bottles used with powdered infant formula (PIF).
Area of Science:
- Microbiology
- Public Health
- Food Safety
Background:
- Infant feeding practices, particularly powdered infant formula (PIF) use, carry risks of infection due to potential microbial contamination.
- Both intrinsic contamination of PIF and extrinsic contamination during preparation can introduce pathogens.
- Evolving recommendations for bottle disinfection necessitate validation of current methods.
Purpose of the Study:
- To validate the efficacy of four common disinfection methods for infant bottles after contamination with PIF.
- To assess decontamination effectiveness at key bottle sites using specific pathogens and a mixed bacterial culture.
Main Methods:
- Bottles containing reconstituted PIF were intentionally contaminated with known concentrations of Enterobacter sakazakii, Bacillus cereus, and Staphylococcus aureus, or a mixed bacterial culture.
- Bottles were cleaned according to standard guidelines before undergoing one of four disinfection procedures (one chemical, three heat-based).
- Multiple sites within the bottles were sampled before and after disinfection to quantify bacterial load.
Main Results:
- The inner screw cap and teat were the most contaminated sites before disinfection.
- All tested disinfection methods, when combined with recommended cleaning and hygiene, effectively decontaminated bottles.
- No Bacillus cereus or Enterobacter sakazakii were detected post-disinfection; Staphylococcus aureus was isolated from a minimal number of sites.
Conclusions:
- Current recommended cleaning and disinfection protocols are effective in decontaminating infant bottles used with PIF.
- Strict adherence to hygiene practices by consumers is paramount for infant safety.
- Effective consumer education by healthcare professionals is essential to ensure proper bottle preparation and reduce infection risks.
Abstract:
Infant susceptibility and the risks posed by infections associated with bottle-fed powdered infant formula (PIF) have received increased attention in recent years. Intrinsic contamination of PIF with pathogens has been reported and extrinsic contamination can be introduced from the handler or the environment during reconstitution. Recommended disinfection advice and bottle decontamination have changed in recent years and the aim of this study was to validate the efficacy of four current disinfection methods using bottles that had contained reconstituted PIF spiked with either a representative mixed bacterial culture or specific pathogens. Initially, bottles (n = 6) of reconstituted formula were spiked with 10(5) cfu/ml representative mixed culture. For subsequent experiments, reconstituted formula was spiked with either 10(2) and 10(4) cfu/ml of Enterobacter sakazakii (Cronobacter), Bacillus cereus and Staphylococcus aureus. Before disinfection, bottles were cleaned according to recommended guidelines. Disinfection procedures tested included a hypochlorite-based chemical solution and three heat-based methods. Bottles were sampled in four sites. Before cleaning and disinfection, the inner screw cap and inner-teat were the most heavily contaminated sites with 1.6-7.4 x 10(3) cfu/per-area-sampled; the bottle interior was more contaminated overall with 1.2 x 10(4) cfu/per-area-sampled. After disinfection, adherence to recommended procedures (combined with good hygiene) enabled effective decontamination to be achieved using all methods. Small differences in disinfection ability were not significant (p > 0.05). Cumulatively, 800 sites were sampled and no B. cereus or E. sakazakii were isolated. S. aureus was isolated from 0.1% of sites with one site exceeding 1 cfu/ml. Findings indicate the potential for bottle contamination and that strict adherence to four currently used methods allowed effective decontamination. This highlights the importance of effective consumer education by health care professionals.
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