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October 17, 2026
By Joseph Wilson
Bangladesh is struggling to contain what has become the world's worst measles outbreak this year, with more than 202,000 suspected cases and 1,147 reported deaths, most of them involving children under five. Health experts say the crisis is exposing dangerous weaknesses in vaccination coverage, disease surveillance and healthcare outreach that could serve as a warning to countries where childhood immunization rates are declining.
According to the World Health Organization, Bangladesh recorded 202,000 suspected measles infections between the beginning of the outbreak in mid-March and October 9. About 22,000 of those cases were laboratory-confirmed. The number of suspected cases is higher than in any other country this year.
Children have been particularly vulnerable. The WHO said 94% of the reported deaths were among children younger than five, highlighting the severe consequences of gaps in childhood immunization and access to healthcare.
The outbreak represents a dramatic reversal for Bangladesh, which had previously made substantial progress toward controlling measles. The WHO has warned that at least 95% vaccination coverage is needed to maintain population immunity and prevent sustained outbreaks. Bangladesh had approached that level in previous years, but routine immunization weakened in 2025.
Health experts say the decline was not caused by a single problem. Vaccine supply shortages, gaps in routine immunization, weaknesses in health data and difficulties reaching children in remote communities all contributed to the growing number of children who were left without adequate protection.
The WHO has also reported that Bangladesh experienced nationwide shortages of measles-rubella vaccines during 2024 and 2025. At the same time, routine immunization gaps and the absence of regular nationwide supplementary measles-rubella campaigns since 2020 allowed the number of susceptible children to grow.
“This is a real warning to every country,” said Mark Jit, a WHO vaccine adviser and professor at New York University's School of Global Public Health.
Jit said preventing a major outbreak through vaccination is safer, cheaper and more effective than trying to control one after transmission has already become widespread. Even when an emergency response eventually brings an outbreak under control, he said, many people will have become sick and some will die in the process.
The human cost of the outbreak can be seen in Bangladesh's rural communities.
In the northeastern Sylhet region, two-year-old Arman Hossain died in July after becoming infected with measles. His family had been unable to have him vaccinated, and his father said health workers did not reach their remote village in time.
Arman's family sold a three-wheeled autorickshaw to pay for his hospital treatment. His four-year-old sister, who was also unvaccinated, survived.
The child's father, Amin Mia, said health workers eventually arrived in the village, but only after his son had died.
Another child, nine-month-old Labiba Akter, died in June in the Sylhet area. Her father, carpenter Humayun Rashid, said his daughter had not been vaccinated despite the emergency campaign temporarily lowering the vaccination age from nine months to six months.
“No health worker came to tell us,” he said.
The experiences of these families illustrate one of the central problems identified by health experts: vaccines may be available, but children can remain unprotected when health systems fail to identify and reach them.
Bangladesh launched an emergency vaccination campaign earlier this year after the outbreak spread rapidly across the country. In April, the government, with support from WHO and other international partners, began a nationwide measles-rubella campaign targeting children between six months and five years of age.
The campaign was designed to reach more than 17.8 million children and achieve at least 95% coverage. Vaccination efforts included routine health facilities as well as outreach activities at schools, religious institutions, transport hubs and hard-to-reach communities.
Nearly 20 million children were reached during the emergency vaccination effort in April and May, according to the Reuters report. But subsequent assessments showed that significant numbers of children had still been missed, particularly in remote areas.
Weak population data made the problem more difficult. Health authorities and international organizations found discrepancies in vaccination records and estimates of the number of children requiring vaccination. Reuters reported that around 40% of children were not properly registered in available data, making it harder for health workers to identify those who had never received a vaccine.
The shortage of healthcare workers has added another obstacle. A significant number of health-sector positions remain vacant, limiting the ability of authorities to conduct door-to-door vaccination, monitor cases and provide timely medical care.
The crisis has also placed enormous pressure on hospitals.
In Sylhet, one of the areas hardest hit by the outbreak, children with measles have been treated in crowded isolation wards. Measles can cause serious complications including pneumonia, severe diarrhea, blindness, brain inflammation and other neurological problems. Children who are malnourished or deficient in vitamin A are at particularly high risk of severe disease.
Although measles is generally preventable through vaccination, it remains one of the world's most contagious infectious diseases. The virus spreads easily through respiratory droplets and can rapidly infect communities where vaccination coverage is insufficient.
The WHO estimates that measles typically kills between two and three people for every 1,000 cases, although mortality can be substantially higher in poorer populations where malnutrition and limited access to medical care increase the risk of complications.
Bangladesh's outbreak also illustrates how quickly progress against infectious diseases can be reversed.
For years, the country had improved measles vaccination coverage and substantially reduced the number of infections. WHO data show that coverage with the first and second doses of measles-containing vaccines increased considerably over the past two decades, while confirmed measles infections fell sharply.
But those gains depended on maintaining strong routine immunization systems. Once vaccination coverage began falling, the number of children susceptible to infection increased.
The problem is particularly serious among children who have received no doses or only one dose of measles-containing vaccine. WHO assessments have found that a substantial proportion of cases occurred among unvaccinated or under-vaccinated children. Most cases have involved children between one and 14 years old, demonstrating the size of the immunity gap created by missed vaccinations.
The outbreak also presents a risk beyond Bangladesh's borders.
Bangladesh shares extensive borders with India and Myanmar, while its major cities, including Dhaka, Chattogram, Sylhet and Cox's Bazar, are important travel and transportation hubs. The WHO has assessed the risk of cross-border transmission as significant because large numbers of people move between communities and countries where vaccination coverage varies.
Myanmar, in particular, has a large population of children who remain unvaccinated amid conflict and humanitarian challenges. India has relatively high vaccination coverage but has also experienced an increase in measles cases, raising concerns about cross-border transmission.
The WHO has assessed the national risk in Bangladesh as high and the regional risk across South-East Asia as high. Globally, the organization considers the risk moderate because of widespread measles transmission, immunity gaps and international population movement.
Bangladesh is now attempting to strengthen its response. Authorities have continued vaccination campaigns, increased disease surveillance, expanded laboratory capacity and prepared hospitals to handle severe cases.
The government is also targeting millions of children who were missed during earlier vaccination efforts. But reaching those children remains difficult because of geography, inadequate health-worker coverage, incomplete population records and limited access to some rural communities.
The country's experience is being closely watched internationally because it demonstrates the consequences of allowing routine vaccination systems to weaken.
The lesson extends beyond measles. Public-health experts have repeatedly warned that diseases controlled through vaccination can return when immunity declines. Once enough people become susceptible, a virus that had been largely contained can spread quickly, overwhelming hospitals and placing the greatest burden on children and other vulnerable groups.
For Bangladesh, the immediate priority is to stop transmission and prevent further deaths. But health officials and international organizations face a longer-term challenge: rebuilding a routine immunization system capable of ensuring that children do not become vulnerable again after the current emergency has ended.
The outbreak has already demonstrated the limitations of relying on emergency vaccination campaigns after a disease has begun spreading widely. Reaching millions of children during an emergency is considerably more difficult than maintaining high vaccination coverage through routine healthcare services.
As Bangladesh continues fighting the outbreak, health experts say other countries should pay close attention. Declining vaccination rates, incomplete health records, shortages of healthcare workers and failures to reach remote communities can combine to create the conditions for a major outbreak.
What is happening in Bangladesh, therefore, is not simply a national health crisis. It is a broader warning about the fragility of progress against vaccine-preventable diseases and the potentially devastating consequences when childhood immunization programs are allowed to weaken.