SARS Prevention   Man: She should have worn a mask. Respiratory droplets can spread germs. Voice-over: Be considerate, wear a mask when you are unwell. Man: Are you feeling better? Voice-over: When visiting hospitals and clinics, do wear a mask. Be vigilant and prepared for SARS.     End-super: SARS Vigilant and Prepared Department of Health website: http://www.dh.gov.hk Hotline: 2833 0111