The Pan American Health Organization has issued a warning that measles risks are currently very high across the Americas. Canada now ranks as the fifth most affected nation in the region as global cases rise.
The 4.8-fold surge in Americas measles cases
Between January 4 and October 3, the Pan American Health Organization (PAHO) confirmed 55,792 measles cases and 77 deaths across 17 countries and territories. According to the PAHO press release dated October 9, this volume of infection is 4.8 times higher than the figures recorded during the same period in 2025.
The vast majority of these infections are concentrated in a small number of nations. The report says that five countries—Guatemala, Mexico, the United States,Peru, and Canada—account for 99.5 per cent of all confirmed cases in the region. This concentration suggests that while the risk is regional, the burden of disease is heavily skewed toward a few specific geographic hubs.
Why Canada lost its measles elimination status in November 2025
Canada's current standing as the fifth most impacted country follows a significant public health setback. As reported by CTVNews.ca, Canada officially lost its measles elimination status in November 2025 after failing to contain a year-long outbreak . This loss of status highlights a fragility in the national health infrastructure that had previously kept the disease at bay for nearly three decades.
Dr. Isaac Bogoch, an infectious diseases specialist at Toronto General Hospital, notes that measles is a highly transmissible infection that efficiently finds non-immune individuals. While Dr. Bogoch explains that most Canadians born after 1970 are protected by one or two vaccine doses, and those born before 1970 typically have natural immunity, the virus continues to circulate in pockets of the population that remain unvaccinated.
The danger to infants under one and pregnant women
Certain demographics face far more severe consequences from the virus. Dawn Bowdish, an immunologist at McMaster University and head of the Firestone Institute for Respiratory Health, warns that measles is especially dangerous for unvaccinated pregnant women, noting the infection can be deadly for the baby and harmful to the mother.
Infants under one year old are also at critical risk because the Public Health Agency of Canada generally recommends against measles-containing vaccines for this age group. while children as young as six months may receive the vaccine if traveling to outbreak zones , Dawn Bowdish emphasizes that the window of vulnerability for infants remains a primary concern for public health officials.
The 95 per cent threshold for Canadian herd immunity
To prevent the rapid spread of measles, countries must maintain a vaccination coverage rate of at least 95 per cent to achieve herd immunity. However, Dawn Bowdish has expressed concern that Canada's current vaccination percentages are significantly lower than this required benchmark, creating "pockets" where the virus can spread with extreme speed.
To combat this, Bowdish suggests that Canada requires increased investment in public health measures.. Specifically, she advocates for mandating proof of vaccination for school attendance and mass gatherings to close the immunity gaps that have allowed the disease to regain a foothold in the country.
Who is tracking the religious travel spikes mentioned by PAHO?
The Pan American Health Organization attributes the current high risk to an expected increase in domestic and international travel for religious events in the coming months. however, the report does not specify which religious events are the primary drivers or which specific travel corridors are most at risk, leaving a gap in actionable data for travelers.
Additionally, while the PAHO urges countries to strengthen surveillance, it remains unclear how Canada is currently identifying the "pockets" of unvaccinated individuals mentioned by experts. Without precise mapping of these low-immunity communities , the ability to deploy rapid response measures remains limited.
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