The current recommendation is that your second dose in a two-dose series should be with the same vaccine or from the same group or class of vaccines, so if you got an mRNA, you get the other mRNA, but there are studies right now in the United Kingdom. We're looking toward getting that data soon, we hope, and that would inform the Canadian strategy going forward.
Also, there is dose mixing, if you like, a mix of different classes of vaccines in Canada that's also being studied, planned and supported.