Techniques like hand washing, wearing gowns, and wearing face masks can help prevent infections from being passed from one person to another. <answer>Frequent hand washing</answer> remains the most important defense against the spread of unwanted organisms. There are other forms of prevention such as avoiding the use of illicit drugs, using a condom, and having a healthy lifestyle with a balanced diet and regular exercise. Cooking foods well and avoiding foods that have been left outside for a long time is also important.
What is the most important defense against the spread of unwanted organisms?
Frequent hand washing