Last Updated: Thursday, January 22, 2009 | 5:07 PM ET CBC News
Dr. Jim Kellner, an infectious disease specialist at the Alberta Children's Hospital in Calgary , will be releasing more details about the cases Thursday afternoon.
A spokesperson for the hospital says the two children aren't related, but lived in the same house.
Doctors said there is no evidence of a link to a confirmed case of meningitis earlier this week.
A seven-year-old Lethbridge boy died of meningitis on Monday night, prompting a health official to warn parents to watch out for symptoms of the disease in that city.
Dr. Vanessa Maclean, the acting medical officer of health for the Chinook Health Region, said Wednesday that investigators weren't able to find the organism that caused the illness.
"This is an isolated case," she said. "We have done our homework, and at this point, other than making people aware, there really is no other followup."
Meningitis is the inflammation of the lining around the brain and spinal cord and can be fatal. It can be spread through close contact, such as coughing, sneezing or kissing. The symptoms include a sudden high fever, a stiff neck and a severe headache.