Survival of biofilm-forming Salmonella on stainless steel bolt threads under dry conditions.

  • Morita Y
  • Komoda E
  • Ono K
 et al. 
  • 11

    Readers

    Mendeley users who have this article in their library.
  • 8

    Citations

    Citations of this article.

Abstract

We examined the survival of two biofilm-forming strains and two biofilm-deficient strains of non typhoid Salmonella (NTS) on stainless steel bolt threads under dry conditions. Five µL of tryptone soya broth or egg yolke mulsion containing NTS strains at a concentration of 9 log cfu/mL was dropped onto the thread surfaces of hexagonal bolts. After inoculation, the bolts were screwed into the nuts, and then removed (Separate type) or not removed (Unit type). The two types of samples were kept in a dry environment (20.0-25.0°C, 2-15% humidity) and bacteria on the surfaces were periodically counted. Biofilm-forming strains were recovered from all samples after 336 days of incubation, but biofilm-deficient strains were isolated from only two of 8 samples after 336 days. This finding demonstrates that NTS can survive for approximately one year on bolt threads, providing direct evidence of the potential risk of constructions having crevices or uneven surfaces as possible contamination sources. The risk of cross-contamination may be higher for biofilm-forming strains than for biofilm-deficient strains.

Author-supplied keywords

  • Biofilms
  • Colony Count, Microbial
  • Construction Materials
  • Construction Materials: microbiology
  • Equipment Contamination
  • Food Contamination
  • Food Contamination: prevention & control
  • Food-Processing Industry
  • Food-Processing Industry: instrumentation
  • Salmonella
  • Salmonella Food Poisoning
  • Salmonella Food Poisoning: prevention & control
  • Salmonella: physiology
  • Stainless Steel
  • Time Factors

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Yukio Morita

  • Emiko Komoda

  • Kazuaki Ono

  • Susumu Kumagai

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free