Which of the following is a personal precaution to take when providing first aid?

Hand washing before and after contact is an essential personal precaution when providing first aid because it helps prevent the spread of infections and protects both the first aider and the patient. Proper hand hygiene reduces the risk of transmitting pathogens that may be present on the first aider's hands or the patient's skin. By thoroughly washing hands with soap and water or using alcohol-based hand sanitizer, the first aider can minimize the chance of cross-contamination, ensuring a safer environment for both parties. This practice is crucial, especially in situations where blood or bodily fluids may be present, as it reinforces overall hygiene and safety protocols during first aid situations.