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Microbiological contamination of domestic kitchen sponges and associated hygiene practices

Assunta De Lella1, Rita Nappi1, Antonietta Anzalone1

  • 1Department of Food Safety Coordination, Istituto Zooprofilattico Sperimentale Del Mezzogiorno, Via Salute, Portici, Italy.

Frontiers in Microbiology
|July 15, 2026
PubMed
Abstract

Insights

Kitchen sponges harbor significant microbial contamination, including harmful bacteria like Escherichia coli and Pseudomonas spp. Visual inspection is unreliable for assessing hygiene, highlighting the need for better kitchen sanitation practices.

Area of Science:

  • Microbiology
  • Food Safety
  • Domestic Hygiene

Background:

  • Kitchen sponges are frequently used and can accumulate diverse microorganisms.
  • This microbial load poses a potential hygiene risk in domestic settings.

Purpose of the Study:

  • To assess the microbiological contamination levels in domestic kitchen sponges.
  • To investigate the correlation between sponge condition, usage, and hygiene practices.

Main Methods:

  • Analysis of 98 kitchen sponges for specific bacteria (e.g., Escherichia coli, Pseudomonas spp.), yeasts, and molds.
  • Classification of sponge condition and collection of data on usage and sanitization habits via questionnaires.

Main Results:

  • High and varied microbial contamination was detected, with notable presence of Enterobacteriaceae and Pseudomonas spp.
  • No significant link was found between the visual condition of sponges and their microbial load.
  • Periodic sanitization showed a trend towards better sponge condition, but this was not statistically significant.

Conclusions:

  • Visual assessment is an inadequate method for determining the microbiological safety of kitchen sponges.
  • While periodic sanitization may improve sponge appearance, its impact on reducing contamination requires further investigation.
Keywords:
Kitchen spongesMicrobial ecosystemsPseudomonasfood safetyfood-handling environments

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