Related: Health Secretary RFK Jr says Texas measles outbreak is not unusual
Canada has lost its measles elimination status after recording 5,138 cases in a year, ending a 27-year measles-free period.
The Pan American Health Organisation (PAHO) declared this, resulting in the entire region of the Americas also losing its status.
This development is attributed to a decline in child vaccination rates in Canada, falling below the 95 per cent coverage required to prevent outbreaks.
Experts have described the loss of status as “worrisome and embarrassing”, with concerns that the US could be the next country to follow suit.
US health secretary Robert F Kennedy Jr, who has promoted vaccine misinformation, acknowledged the serious impact of the measles outbreak.