Final answer:
Proper hand hygiene should be performed in all instances according to the CDC. This includes washing hands before, during, and after various activities to prevent the transmission of harmful pathogens.
Step-by-step explanation:
Proper hand hygiene should be performed in all instances according to the CDC. This includes washing hands before, during, and after food handling, before eating, before and after interacting with someone who is ill, before and after treating a wound, after using the toilet or changing diapers, after coughing, sneezing, or blowing the nose, after handling garbage, and after interacting with an animal, its feed, or its waste. It is important to wash hands even if they are not visibly dirty, as harmful pathogens can still be present.