This document provides information about H1N1 influenza, including how it is transmitted between people, who is most at risk, symptoms, prevention, and guidance for workplaces and supervisors. H1N1 can be transmitted through respiratory droplets from coughs or sneezes and touching contaminated surfaces. Those most at risk include pregnant women and people with underlying health conditions. Prevention focuses on good hygiene like handwashing and staying home when sick. Workplace guidance includes cleaning surfaces, avoiding contact with sick coworkers, and allowing employees to stay home until symptoms resolve.