Canadian kids heading back to school may face an increased risk of vaccine-preventable illnesses such as flu, measles, and COVID-19. Experts warn that it typically takes two to four weeks for the body to respond to a flu shot after vaccination. According to Dr. Ayisha Kurji, pediatrician at the University of Saskatchewan, the colder weather and indoor settings can lead to a surge in respiratory threats. The federal surveillance report shows low levels of influenza, COVID-19, and RSV, which are expected to increase in the coming months.
Written by the local model on 2026-09-03,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Vaccine-preventable illnesses on the horizon again as Canadian kids head back to school
Families should consider 'suite of vaccines' to combat viral infections from flu to measles, experts say
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experts → head → measles
With millions of Canadian kids heading back to school and temperatures set to drop, it’s time to brace for another fall of seasonal illnesses — and medical experts say staying healthy takes more than just a flu shot.
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staying → head → shot
The latest federal surveillance report, which tracks influenza, COVID-19 and respiratory syncytial virus (RSV), shows it’s likely the calm before the storm, with low and stable levels of all three respiratory threats that are set to come roaring back in the months ahead.
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that → track → months
“As we transition to colder weather and we’re inside more, that’s when the bugs spread … and that’s when we see our emergency department visits start to go up, and then kids in the hospital more,” said Saskatoon-based pediatrician Dr. Ayisha Kurji, an assistant professor at the University of Saskatchewan.
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Kurji → transition → Saskatchewan
McMaster University immunologist Matthew Miller says Canadians should already start assessing their options to get seasonal vaccines.
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Canadians → say → vaccines
For flu specifically, he noted that last year included a “really unusual severe early peak” in influenza circulation.
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year → note → circulation
“We saw really high case counts in … early December, which is about a month in advance of when we normally see flu season peak,” Miller said.
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Miller → see → advance
“What that means is that it's really important to be immunized in a timely manner in the fall to ensure that our immune systems have time to respond to the vaccine and mount that protective immunity.
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systems → mean → immunity
It typically takes around two to four weeks for the body to hit a peak immune response to the shot, he said.
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he → take → shot
And Miller stressed that a fall flu shot — which is recommended for all Canadians aged six months and up — is just one piece of the “suite of vaccines” families should consider.
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families → stress → vaccines
Measles, for example, has continued circulating, and this fall may see further spread.
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continued → continue → spread
“Coming out of the summer months where families have often travelled ... puts everybody at increased risk when the school year starts again,” said Miller, “and all these young children, who have been to all kinds of different places, are now in close quarters again in classrooms.”
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who → come → classrooms
Flu, COVID, RSV shots available for fall
Canada’s national vaccine advisory body recommends a COVID shot for higher-risk individuals, including older adults 65 and up and anyone who is pregnant or has underlying medical conditions.
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who → recommend → conditions
“I still recommend the COVID vaccine because it’s still something that’s around, and still sends people into hospital,” said Kurji.
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Kurji → recommend → hospital
RSV vaccines are also available for older adults and pregnant individuals, to combat what Miller called an “extraordinarily dangerous virus to newborns.”
Real-world research has shown these relatively new shots are making a huge difference in serious RSV-related illness, with one large study showing the vaccine given during pregnancy cut babies’ hospital risk by more than 80 per cent.
“
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vaccine → combat → cent
It's really having a profound impact on reducing rates of infection and particularly severe infection in these age groups — older adults and, in particular, newborns,” Miller said.
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Miller → have → groups
Beyond seasonal vaccines, experts stress Canadians need to stay up to date on their routine shots as well, given the resurgence of a range of vaccine-preventable diseases like measles, which can lead to flu-like symptoms and a blotchy rash, or in more serious cases, pneumonia, brain swelling, or even death.
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which → stress → cases
“We have seen, since the pandemic, a decrease in uptake in the basic regular childhood vaccines,” said Dr. Joss Reimer, Canada’s chief public health officer.
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Reimer → see → vaccines
“The recent spread of measles really shows us exactly what we need to be worried about,” she added.
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she → show → what
“As soon as our numbers dip below a certain level, we do start to see these viruses come back and put children at risk, especially those kids who are either too young or, for some other health reason, can't get vaccinated.”
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who → dip → reason
Measles resurgence across Canada, U.S.
Just 85 per cent of two-year-olds in Canada were fully vaccinated against measles, mumps and rubella by the end of 2025, federal data shows — a far cry from the 95 per cent medical experts say is needed population-wide to keep measles at bay.
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experts → vaccinate → bay
The same data shows less than 80 per cent of children that age were fully vaccinated with the shot targeting diphtheria, tetanus, and whooping cough.
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cent → show → diphtheria
Middling vaccination rates in recent years have contributed to an explosion of measles, one of the world’s most contagious viruses, across North America.
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rates → contribute → America
The U.S. has seen 37 new outbreaks so far in 2026, involving thousands of cases, while Canada lost its official measles elimination status last November after racking up more than 5,000 infections since late 2024, and more than 1,000 new cases just this year.
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Canada → see → cases
B.C.'s provincial health officer Dr. Bonnie Henry recently said most of the 30 people hospitalized since the start of that province's outbreak last year have been unvaccinated children.
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most → say → outbreak
“It’s sad to me that’s that where we are,” Kurji said.
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Kurji → ’ → me
Most modern clinicians haven’t even witnessed a real measles infection in their lifetime, Kurji added, which means cases can be tougher to spot and precautions to prevent onward transmission may not be put in place fast enough.
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precautions → witness → place
