Final answer:
After touching an infected wound with their finger, a food handler must wash their hands to prevent the spread of diseases.
Step-by-step explanation:
After touching an infected wound with their finger, a food handler must wash their hands. Washing hands with soap and warm running water is the most effective way to remove pathogens and prevent the spread of diseases. It is recommended to wash hands before and after food handling, before eating, after treating a wound, and after using the toilet or changing diapers. Hand sanitizer can be used if soap and water are not available.