Article 1 Bacteria 1 Bubbles 1 Cell culture 1 Cell culture methods 1 Cleaning 1 Electrolytes 1 Food Microbiology 1 Food Safety 1 Food safety 1 Foodborne Diseases 1 Foodborne diseases 1 Foodborne infections Macroscopic and microscopic 1 Microbial contaminant 1 Microbial contamination 1 Microbiological quality 1 Ready-to-eat salads 1 Salads 1 Significant surfaces 1 Spinacia oleracea 1 Ultrasonic Waves 1 Ultrasonic applications 1 Ultrasonic cleaning 1 Ultrasound 1 Unmanned aerial vehicles (UAV) 1 Viable but non-culturable 1 bacterium 1 cleaning 1 comparative study 1