Thousands of people, mostly children, in the U.S., Canada, and Mexico have contracted the vaccine-preventable disease this year.

Dr. Kieran Moore, chief medical officer of health, issued a statement Thursday saying a southwestern Ontario infant has died after being born prematurely and infected with the highly contagious virus through the mother.

An infant infected with measles has died in southwestern Ontario, Canada, the province's chief medical officer of health said in a statement on Thursday."An infant, born prematurely and infected with measles,