Final answer:
The CDC advises using hand sanitizer with at least 60% alcohol to kill microorganisms when soap and water aren't available, supporting personal hygiene and infection prevention.
Step-by-step explanation:
The CDC recommends the use of hand sanitizer when soap and water are not immediately available to help kill microorganisms on the rescuer's hands. Hand sanitizers should contain at least 60% alcohol to be effective in killing most types of germs, bacteria, and viruses, including the coronavirus. The proper handwashing method involves using soap and warm running water, and if not available, using a hand sanitizer is the next best option for maintaining personal hygiene and preventing the spread of infections.