Ontario's chief medical officer of health says six infants have been born with congenital measles since an outbreak began last fall, adding they were infected in the womb through mothers who were not vaccinated.

Six babies have been born with congenital measles in Ontario, Canada, amid the largest outbreak of the disease in the western hemisphere since late 2024, according to Ontario’s chief medical officer of health,

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