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Hand Washing: the original infection defense

Hand Washing — the original infection defense. Hand hygiene remains one of the most effective ways to reduce respiratory and gastrointestinal infections. Soap and water physically remove pathogens, while the time spent scrubbing matters more than water temperature. Scrubbing for 20 seconds, including under nails and between fingers, is the standard recommendation. The evidence is strongest when the habit is repeated rather than intensified. It modulates the microbiome, vagus nerve signaling and short-chain fatty acid production. Adjust the dose or timing based on how you feel rather than a rigid rule. For most adults, wash hands after returning home, before eating and after coughing or sneezing. The compound interest of daily habits is the real secret weapon.