etiquette- practice of covering your mouth and nose with a tissue while coughing or sneezing, or sneezing into your sleeve

sanitation- food safety practices that maintain the safety of food you handle and eat; includes refrigerating and freezing certain foods, cooking meat thoroughly, and washing vegetables and fruits

substance that contains a dead or nontoxic part of a pathogen that is injected into a person to train that person's immune system to eliminate the live pathogen