Public health in Canada: a difficult history.

Although the outbreak of severe acute respiratory syndrome in 2003 was the event that focused attention on Canada's capacity in public health, there have been, and will be, many other public health challenges, not just in the form of outbreaks but of a diverse set of threats to health, both infectious and non-infectious. Like many other countries, Canada must face the challenge of building and sustaining the capacity to respond to this broad range of challenges. Recently, there has been an emphasis on strengthening the public health infrastructure, including inter-jurisdictional agreements, research, knowledge translation, information systems and the workforce.