Internal documents show how Alberta’s measles outbreak began to spiral out of control

Newly released documents paint a picture of how Alberta’s measles outbreak began with a handful of isolated cases and started to grow into what is now the worst in North America, as public-health measures to control spread in some cases proved ineffective.

The documents, obtained through a freedom of information request, offer the most detailed illustration yet of the early days of Alberta’s measles outbreak and how the government impeded some health officials’ efforts to stop it.