Volume 10, Number 11—November 2004
Policy Review
Public Health Interventions and SARS Spread, 20031
Figure

Figure. Severe acute respiratory syndrome cases in Singapore, February 25–May 5, 2003. Number of primary cases (green) by time from symptom onset to isolation, number of secondary cases infected by such cases (orange), and mean number of secondary cases per primary case. Reprinted with permission from Lipsitch M, Cohen T, Cooper B, Robins JM, Ma S, James L, et al. Science 2003;300:1966–70. Copyright 2003 by the American Association for the Advancement of Science. http://www.sciencemag.org
1The members of the World Health Organization (WHO) Working Group are as follows: Ximena Aguilera, Ministerio de Salud, Republica de Chile; Roy Anderson, Imperial College London, United Kingdom; Dounia Bitar, Institut de Veille Sanitaire, Paris France; Martin Cetron (with Pattie Simone), Centers for Disease Control and Prevention, Atlanta, Georgia, USA; Chew Suok Kai (with Benjamin KW Koh), Ministry of Health, Singapore; Clete DiGiovanni, Jr., Defense Threat Reduction Agency, Fort Belvoir, Virginia, USA; Arlene King, Health Canada, Ottawa, Canada; Cindy K-L Lai (with PL Ma), Department of Health, Hong Kong Special Administrative Region, China; Angus Nicoll (with Jane Leese), Communicable Disease Surveillance Centre, London, United Kingdom; Sonja Olsen, International Emerging Infections Program, Nonthaburi, Thailand; Alice Sarradet, Direction Generale de la Sante, Paris, France; Mingchang Song, General Administration of Quality Supervision, Inspection and Quarantine, (AQSIQ), Beijing, China; Ron St. John (with Susan Courage), Health Canada, Ottawa, Canada; Robert Steffen (with Leonie Prasad), University of Zurich, Switzerland; Ih-Jen Su (with SK Lai), Taiwan Center for Disease Control, Taipei, Taiwan, China; WHO Staff in the Department of Communicable Diseases Surveillance and Response (CSR): Julie Hall, Beijing, China; Emmanuel Jesuthasan, Geneva, Switzerland; Angela Merianos, Cathy Roth, Max Hardiman, Geneva, Switzerland; Hitoshi Oshitani, Western Pacific Regional Office, Manila, Philippines; and group facilitator: David Bell, WHO (CSR) Geneva, Switzerland, and Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
2The term “isolation” is applied to ill people; “quarantine” is applied to persons who have been exposed but are not ill.