1. Prophylaxis is the prevention of or protective treatment for disease.
2. Prophylaxis is an infection control measure whereby antimicrobial, including antiviral, medications are taken by a healthy individual (e.g. nurse, contact) to prevent illness before or after being exposed to an individual with an infectious disease.
(2006, Pandemic Influenza Business Continuity Guide & Template for San Francisco Businesses. San Francisco Department of Public Health. Communicable Disease Control and Prevention Section.)