[Coliform bacteria in rinsed beer mugs--identification with the API 20 E system and resistance behavior]

Area of Science:

• Microbiology
• Food Safety
• Public Health

Context:

• Beer mugs are frequently used in public settings, necessitating effective cleaning protocols.
• Dishwashing methods, including mechanical conveyor belt systems and open vats, vary in their microbial removal efficacy.
• Coliform bacteria, particularly fecal coliforms, serve as indicators of fecal contamination and potential pathogen presence.

Purpose:

• To compare the microbial contamination levels of beer mugs cleaned by mechanical dishwashers versus open vats.
• To biochemically characterize coliform strains isolated from beer mugs and assess their antimicrobial resistance.
• To evaluate the role of dishwashing practices in the dissemination of clinically relevant and multiresistant bacteria.

Summary:

• A study investigated fecal and total coliform contamination in 653 mechanically washed and 182 open vat-cleaned beer mugs.
• Open vat cleaning showed significantly higher contamination rates for both fecal (12.1% vs. 4.7%) and total coliforms (67.6% vs. 30.3%).
• Biochemical analysis of 213 coliform strains identified 19 species, with Klebsiella oxytoca being most prevalent. Notably, 44 strains exhibited resistance to three or more antimicrobial agents, suggesting a link between unhygienic practices and the spread of multiresistant germs.

Impact:

• Unhygienic dishwashing procedures in food service establishments can contribute to the spread of multiresistant bacteria.
• Findings highlight the importance of implementing and maintaining effective cleaning and disinfection protocols to ensure public health.
• This research underscores the potential role of seemingly minor hygiene lapses in the broader epidemiology of antibiotic resistance.