The primary mode of transmission is by direct mucous membrane (eyes, nose and mouth) contact with infectious agents. The main routes are through contaminated hands or direct exposure to respiratory droplets -contact and droplet. The basic reproduction ratio of three is consistent with the main mode of transmission by droplets. However, airborne transmission of SARS can indeed occur in hospital and in community housing complexes. 9 Infected cases occurred primarily in persons in close contact with ill SARS patients in healthcare and household settings. Transmission to casual and social contacts has occasionally occurred, especially as a result of intense exposure to SARS patients eg. in lifts, in the workplace, on airlines or in taxis.