Final answer:
The manager should ensure that the food handler washes their hands and covers the lesion with an impermeable cover to maintain food safety and prevent pathogen spread.
Step-by-step explanation:
When a food handler has a lesion with pus, a manager should follow the best practices for food safety and ensure that the handler washes their hands and covers the lesion with an impermeable cover before they continue to handle food. This step helps to prevent the spread of pathogens and protects the food from contamination. By examining bacteria under a microscope, scientists can learn about their shape, size, and other characteristics that may suggest the type of bacteria and help in selecting an appropriate treatment. Moreover, following stringent hand hygiene practices can prevent the spread of infections in clinical settings.