Tracking sources of Staphylococcus aureus hand contamination in food handlers by spa typing

Area of Science:

• Microbiology
• Food Safety
• Public Health

Background:

• Staphylococcus aureus is a common cause of foodborne illness.
• Hand contamination is a primary route for pathogen transmission in food handling environments.
• Identifying the source of contamination is key to effective control strategies.

Purpose of the Study:

• To determine the primary source of Staphylococcus aureus contamination on the hands of food handlers.
• To investigate the relationship between nasal carriage and hand contamination.
• To inform interventions for reducing pathogen transmission in food service settings.

Main Methods:

• Collection of nasal samples and direct fingertip imprints from food handlers on two separate occasions.
• Microbiological characterization of Staphylococcus aureus isolates from nasal and hand samples.
• Comparison of isolate profiles to identify potential transmission routes.

Main Results:

• The majority of hand contamination with Staphylococcus aureus was linked to nasal isolates from persistently colonized coworkers.
• Environmental contamination, likely from colonized individuals, was identified as a significant factor.
• Individual food handler colonization status influenced hand contamination levels.

Conclusions:

• Nasal carriage by coworkers is a major reservoir for Staphylococcus aureus hand contamination in food handlers.
• Environmental hygiene and disinfection are critical complements to handwashing protocols.
• Targeted interventions for persistently colonized individuals may reduce overall transmission risk.