They say both cases were picked up in southern Alberta in mid-August.
A man and a woman, both between 40 and 55 years old, have the less serious form of the mosquito-borne virus.
Dr. James Talbot, Alberta's chief medical health officer, urges people to wear insect repellant, long-sleeved shirts and light-coloured clothing when outside.
Even better, he says, is to stay indoors at dawn and dusk when mosquitoes are most active.
Symptoms include fever, chills, nausea, vomiting, fatigue, skin rash, swollen glands and headache.
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