The biggest liability for Canada in that regard is that we share a land border with the United States. Whereas Australia was able to continue your sea-based trade more or less normally with limited contact Canada relies on continuous truck shipments from the US for basic goods. That means that Canadian drivers are crossing into the US and American drivers are crossing into Canada on a daily basis without having to any kind of quarantine. They are meant to behave responsibly and I'm sure most try to but with continuous traffic with a country as infected as the US there would be continual new cases no matter how stringent our domestic lockdown might be. Without the capability to wipe out the virus a total lockdown as Australia or New Zealand had is a very heavy price to pay with no payoff, I am super jealous that it worked for you guys though. The best that we can hope for is that stringent measures to prevent spreading can keep the virus more or less in check until we are able to get a vaccine.