Ontario measles outbreak at more than 1,600 cases
Ontario's ongoing measles outbreak has now topped 1,600 cases as it continues to grow and spread across the province.
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In the past week alone, 182 new cases were reported by public health agencies in the province, bringing the total number of cases to 1,622 and making the outbreak the largest in at least three decades.
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Most of the new cases were in parts of southwestern Ontario that have been at the epicentre of the outbreak that began last fall at a Mennonite community gathering in New Brunswick.
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There were also two cases in the Eastern Ontario Health Unit, south and east of Ottawa, the first in that area. Renfrew County and the South East Health Unit, both of which border Ottawa, have previously reported cases associated with the large outbreak.
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Earlier this month, Ottawa Public Health reported two cases of measles, the city's first since 2019, in an adult and child from the same family who had recently travelled internationally. There have been no reports of spread associated with those cases and they are not related to the larger outbreak, which is community spread.
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The majority of infections have been in infants, children and adolescents who were unvaccinated. To date, 119 people have been hospitalized as a result of measles infections in Ontario and nine have required intensive care. There have been no deaths.
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The outbreak has become a hot-button political issue with opposition politicians calling for the government to do more to promote vaccination uptake and counter lagging vaccination rates.
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Public health officials and local infection control experts have warned that measles cases related to the outbreak, and infections related to travel, will likely continue.
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Winnipeg Free Press
a day ago
- Winnipeg Free Press
Measles outbreaks in Michigan and Pennsylvania end, while Texas logs just 4 new cases
The U.S. logged 122 more cases of measles this week — but only four of them in Texas — while the outbreaks in Pennsylvania and Michigan have officially ended. There are 1,168 confirmed measles cases in the U.S., the Centers for Disease Control and Prevention said Friday. Health officials in Texas, where the nation's biggest outbreak raged during the late winter and spring, said they'll now post case counts only once a week — yet another sign the outbreak is slowing. There are three other major outbreaks in North America. The longest, in Ontario, Canada, has resulted in 2,009 cases from mid-October through June 3. The province logged its first death Thursday in a baby that got congenital measles but also had other preexisting conditions. Another outbreak in Alberta, Canada, has sickened 761 as of Thursday. And the Mexican state of Chihuahua had 1,940 measles cases and four deaths as of Friday, according to data from the state health ministry. Other U.S. states with active outbreaks — which the CDC defines as three or more related cases — include Colorado, Kansas, Montana, North Dakota, Ohio and Tennessee. In the U.S., two elementary school-aged children in the epicenter in West Texas and an adult in New Mexico have died of measles this year. All were unvaccinated. Measles is caused by a highly contagious virus that's airborne and spreads easily when an infected person breathes, sneezes or coughs. It is preventable through vaccines, and has been considered eliminated from the U.S. since 2000. How many measles cases are there in Texas? There are a total of 742 cases across 35 counties, most of them in West Texas, state health officials said Friday. Throughout the outbreak, 94 people have been hospitalized. State health officials estimated less than 1% of cases — fewer than 10 — are actively infectious. Fifty-five percent of Texas' cases are in Gaines County, where the virus started spreading in a close-knit, undervaccinated Mennonite community. The county has had 411 cases since late January — just under 2% of the county's residents. The April 3 death in Texas was an 8-year-old child, according to Health Secretary Robert F. Kennedy Jr. Local health officials said the child did not have underlying health conditions and died of 'what the child's doctor described as measles pulmonary failure.' A unvaccinated child with no underlying conditions died of measles in Texas in late February; Kennedy said the child was 6. How many measles cases are there in New Mexico? New Mexico added two cases in the past week for a total of 81. Seven people have been hospitalized since the outbreak started. Most of the state's cases are in Lea County. Sandoval County near Albuquerque has six cases, Eddy County has three, Doña Ana County has two. Chaves, Curry and San Juan counties have one each. An unvaccinated adult died of measles-related illness March 6. The person did not seek medical care. How many cases are there in Oklahoma? Oklahoma added one case this week for a total of 15 confirmed and three probable cases. The state health department is not releasing which counties have cases. How many cases are there in Colorado? Colorado has seen a total of 12 measles cases in 2025, which includes one outbreak of seven related cases. The outbreak is linked to a Turkish Airlines flight that landed at Denver International Airport in mid-May, and includes three cases each in Arapahoe and El Paso counties and one in Denver, plus a person who doesn't live in Colorado. Other counties that have seen measles this year include Archuleta and Pueblo. How many cases are there in Kansas? Kansas has a total of 71 cases across 11 counties in the southwestern part of the state, with three hospitalizations. All but two of the cases are connected, and most are in Gray County. How many cases are there in Montana? Montana has 17 measles cases as of Thursday. Ten are in Gallatin County, which is where the first cases showed up — Montana's first in 35 years. Flathead and Yellowstone counties have two cases each, and Hill County has three case. There are outbreaks in neighboring North Dakota and the Canadian provinces of Alberta, British Columbia and Saskatchewan. How many cases are there in North Dakota? North Dakota, which hadn't seen measles since 2011, is up to 34 cases as of Friday. Two of the people have been hospitalized, and all of the people with confirmed cases were not vaccinated. There are 16 cases in Williams County in western North Dakota on the Montana border. On the eastern side of the state on the Minnesota border, there are 10 cases in Grand Forks County and seven cases in Cass County. Burke County, in northwest North Dakota on the border of Saskatchewan, Canada, has one case. How many cases are there in Ohio? Ohio remained steady for a third week at 34 measles cases and one hospitalization, according to the Ohio Department of Health. That count includes only Ohio residents. The state has two outbreaks: Ashtabula County near Cleveland has 16 cases, and Knox County in east-central Ohio has 20 — 14 among Ohio residents and the rest among visitors. Allen, Cuyahoga, Holmes and Defiance counties have one case each. How many cases are there in Tennessee? Tennessee has had six measles cases since early May, but no change since. Tennessee's outbreak appears to be over, as health officials say there have not been any new cases in six weeks. Where else is measles showing up in the U.S.? Measles cases also have been reported in Alaska, Arkansas, California, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New York, Pennsylvania, Rhode Island, South Dakota, Vermont, Virginia and Washington. Earlier outbreaks in Indiana, Michigan and Pennsylvania were declared over by health officials after six weeks of no new cases. Cases and outbreaks in the U.S. are frequently traced to someone who caught the disease abroad. The CDC said in May that more than twice as many measles have come from outside of the U.S. compared to May of last year, and most of those are in unvaccinated Americans returning home. In 2019, the U.S. saw 1,274 cases and almost lost its status of having eliminated measles. What do you need to know about the MMR vaccine? The best way to avoid measles is to get the measles, mumps and rubella vaccine. The first shot is recommended for children between 12 and 15 months old and the second between 4 and 6 years old. Getting another MMR shot as an adult is harmless if there are concerns about waning immunity, the CDC says. People who have documentation of receiving a live measles vaccine in the 1960s don't need to be revaccinated, but people who were immunized before 1968 with an ineffective vaccine made from 'killed' virus should be revaccinated with at least one dose, the agency said. People who have documentation that they had measles are immune, and those born before 1957 generally don't need the shots because so many children got measles back then that they have 'presumptive immunity.' Measles has a harder time spreading through communities with high vaccination rates — above 95% — due to 'herd immunity.' But childhood vaccination rates have declined nationwide since the pandemic and more parents are claiming religious or personal conscience waivers to exempt their kids from required shots. What are the symptoms of measles? Measles first infects the respiratory tract, then spreads throughout the body, causing a high fever, runny nose, cough, red, watery eyes and a rash. The rash generally appears three to five days after the first symptoms, beginning as flat red spots on the face and then spreading downward to the neck, trunk, arms, legs and feet. When the rash appears, the fever may spike over 104 degrees Fahrenheit, according to the CDC. Most kids will recover from measles, but infection can lead to dangerous complications such as pneumonia, blindness, brain swelling and death. How can you treat measles? There's no specific treatment for measles, so doctors generally try to alleviate symptoms, prevent complications and keep patients comfortable. ___ The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute's Science and Educational Media Group and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.
CBC
2 days ago
- CBC
What we know about measles during pregancy
Social Sharing The death of an Ontario infant born prematurely and infected with measles through the mother is raising questions about how the virus is transmitted during pregnancy. On Thursday, Ontario health officials announced the death of a baby who was infected with the virus while in the womb. It was the first fatality in the provincial outbreak that began on Oct. 28 last year and includes 2,009 probable and confirmed cases. "While measles may have been a contributing factor in both the premature birth and death, the infant also faced other serious medical complications unrelated to the virus," Dr. Kieran Moore, Ontario's chief medical officer of health, said in a statement released Thursday. Measles is a respiratory infection with symptoms that include fever, a blotchy rash, a cough and red, watery eyes. In May 2024, a child under five died of measles in Hamilton, but before that, there were no measles deaths in the province in more than a decade. Moore has previously said the current outbreak was traced to a Mennonite wedding in New Brunswick, and is spreading primarily in Mennonite and Amish communities where vaccination rates lag. The majority of those cases are in southwestern Ontario. WATCH | Death of a measles-infected baby in Ontario: Measles-infected baby dies in southwestern Ontario 6 hours ago Duration 2:45 An infant born prematurely and infected with measles in the womb through their mother has died, Ontario's Chief Medical Officer Dr. Kieran Moore announced Thursday. It is the province's first recorded death from the current outbreak that started in October of last year. Health officials stress that anyone who isn't vaccinated is vulnerable to measles and they encourage everyone to ensure they are up to date on their Measles, Mumps and Rubella (MMR) vaccines. "I urge everyone, but especially those who may become pregnant, to ensure they have received two doses of the MMR vaccine, which will protect both a parent and baby," said Moore. What is known about measles transmission during pregnancy? Dr. Jacqueline Wong, a pediatric infectious diseases specialist at McMaster Children's Hospital, says transmission of measles during pregnancy is rare. If the baby does contract measles from the mother in utero, Wong says the impact varies depending on how far along the pregnancy is. "Your risk of transmitting the infection to the baby varies during the different trimesters because of the development of the fetus, the development of the placenta and the blood flow." What are the risks during pregnancy? Dr. Sheryl Choo, a maternal-fetal medicine specialist at Royal Alexandra Hospital in Edmonton, says there are serious complications that can result if people who are pregnant become infected with measles. For instance, she says pregnant people infected with measles can develop lung infections like pneumonia at almost double the rate of those who are not pregnant. If people become infected with measles during pregnancy, Choo notes it can also increase the risk of serious complications including miscarriage and premature birth. According to Moore, the MMR vaccine has been safely used for over 50 years and is highly effective. "Two doses provide nearly 100 per cent protection," he said in a statement Thursday. What about risks to the baby? Babies born to those infected with measles can face complications related to premature birth, such as low birth weight and breathing issues, which can result in stays in the neonatal intensive care unit, Choo said. This is all on top of the symptoms of a measles infection itself, she said. Much rarer complications of measles can include subacute sclerosing panencephalitis, or SSPE. It is almost always fatal and generally develops seven to 10 years after an initial measles infection, even if the person appears to have fully recovered. It can be dormant in the brain for years and may eventually flare up, causing brain inflammation and resulting in children or young adults losing the ability to move and speak. According to the Public Health Agency of Canada, SSPE occurs in between four and 11 out of every 100,000 measles cases. Health officials say it strikes between seven and 11 years after an initial infection and the highest rates are among children who contract measles before the age of two. If I'm pregnant can I get the measles vaccine? No, the measles vaccine is not recommended to be administered to people who are already pregnant. "If you want to take the measles vaccine, it has to be before you're pregnant," Choo said. That's because the measles vaccine contains a live strain that is a weakened form of the virus, which is not recommended during pregnancy. Choo says that's because there is a theoretical risk that the measles virus contained in the vaccine can be passed to the baby. In contrast, vaccines that contain inactivated viruses can be given during pregnancy. The flu vaccine is one example. Is there treatment for pregnant people exposed to measles? If you're pregnant and you think you may have been exposed to measles, health officials advise you to contact your local health authority. They can determine if exposure occurred and direct patients to seek appropriate care without contributing to further spread. If measles exposure is confirmed, Choo says there is an injectable medication option called IVIg. Depending on when the exposure occurred, the medication may be used to help protect against infection or reduce severity of the illness. However, health officials and doctors agree that the best way to protect against measles is immunization.
CBC
2 days ago
- CBC
Measles-infected newborn baby dies in southwestern Ontario
Ontario's Ministry of Health has announced the first recorded death of a measles patient from the current outbreak that started in October. 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. Moore offered few other details. Southwestern Public Health, which covers Oxford and Elgin counties, confirmed the child was from a community in their coverage area. "The infant contracted the virus before birth from their mother, who had not received the measles, mumps and rubella [MMR] vaccine," Moore wrote. "While measles may have been a contributing factor in both the premature birth and death, the infant also faced other serious medical complications unrelated to the virus. "Out of respect for the family's privacy, no further personal or medical details will be shared." The death is the first in this outbreak, which at last count, on Tuesday, included up 2009 probable and confirmed cases since it began on Oct. 28, according to the ministry. It's only the second measles-related death the province has seen in decades, after an unvaccinated child from Hamilton who was younger than five years old died in May 2024. Current outbreak traced to wedding Previously, Moore shared that this outbreak in Ontario was traced back to a Mennonite wedding in New Brunswick, and is spreading primarily in Mennonite and Amish communities where vaccination rates lag. The vast majority of those cases are in southwestern Ontario. The official case count in the current outbreak is likely lower than the actual number as many cases aren't being reported, health officials have said. Case counts have been highest in the areas covered by Southwestern Public Health, Chatham-Kent Public Health, Huron-Perth Public Health, Grand Erie Public Health and the Windsor-Essex County Health Unit. In May alone, 79 people were diagnosed with measles by Southwestern Public Health, which by far has the largest case count in the province. Seventy-five per cent of patients in that health unit were younger than 18. Those most at risk from the measles virus are unvaccinated children, health officials have warned throughout the outbreak. "Measles poses a serious risk to unvaccinated individuals and to infants in the early stages of life in particular," Moore wrote in the release Thursday. "Anyone who is unvaccinated is at risk and I urge everyone, but especially those who may become pregnant, to ensure they have received two doses of the MMR vaccine, which will protect both a parent and baby. This vaccine has been safely used for over 50 years and is highly effective. Two doses provide nearly 100 per cent protection." Officials in public health areas affected by the outbreak have told reporters they've poured resources into delivering that message to rural communities in different languages and through outreach to faith leaders. Moore said measles is one of the most contagious known diseases. Complications from infection can include pneumonia, brain swelling, premature birth and death. Those seeking vaccination are urged to contact their local health units.
