Currently, the virus is not transmitted in Canada. The mosquitoes that transmit the virus can't live in our cold weather. As Matt said, there's research going on to see if Canadian mosquitoes could transmit the virus. Currently, there's a very low risk of that happening in Canada.
The risk is for Canadians who travel outside the country to countries where it's being circulated. Currently, we're not aware of any risk for anyone specifically, other than pregnant women. The association or the risk for a pregnant woman who gets infected with the Zika virus is the neurodevelopmental problems in the fetus, be it microcephaly, small brain, or other developmental disorders. There's even some new evidence suggesting that it can affect outside the neurological system, but those are all just associations so far.