title: Infectivity of severe acute respiratory syndrome during its incubation period.
authors.affiliation: Chinese Field Epidemiology Training Program, Chinese Center for Disease Control and Prevention, Beijing 100050, China. zeng4605@vip.sina.com
authors.forename: Guang
authors.initials: G
authors.lastname: Zeng
authors.forename: Shu-Yun
authors.initials: SY
authors.lastname: Xie
authors.forename: Qin
authors.initials: Q
authors.lastname: Li
authors.forename: Jian-Ming
authors.initials: JM
authors.lastname: Ou