Government data from the height of the 2026 outbreak reveal that most infections struck children who received no measles vaccine doses, exposing deep gaps that have fuelled a deadly nationwide epidemic claiming over 1,000 lives.

Bangladesh is grappling with its worst measles outbreak in decades, a crisis that has infected hundreds of thousands of children and left more than 1,000 dead since mid-March 2026. Official figures released by the Directorate General of Health Services (DGHS) during the early peak of the outbreak showed that 59 per cent of suspected measles patients had not received either of the two recommended doses of the measles-rubella (MR) vaccine. Another 19 per cent had received only the first dose, while just 22 per cent were fully vaccinated. Among laboratory-confirmed cases, the picture was even starker: 74 per cent had received no vaccine at all, 14 per cent only one dose, and 12 per cent both doses.

These numbers, shared at a DGHS press conference in late April 2026 alongside officials from UNICEF and the World Health Organization, laid bare the immunity gaps that allowed the highly contagious virus to explode across 58 of the country’s 64 districts. The findings underscored a painful reality for a nation that had previously made strong progress toward measles elimination: declining routine immunisation coverage, missed supplementary campaigns, and disruptions in vaccine supply left millions of children unprotected.

Vaccination Status Reveals Critical Protection Failures

The two-dose MR vaccine is administered in Bangladesh at nine months and 15 months of age under the Expanded Programme on Immunisation. Herd immunity against measles typically requires sustained coverage of at least 95 per cent. Yet data from the 2023 Coverage Evaluation Survey already showed first-dose coverage slipping to around 86 per cent and second-dose coverage to 80.7 per cent. Political upheaval in 2024, procurement changes, and the cancellation of a planned nationwide campaign in 2025 further widened the gap. Government figures later indicated that only about 59 per cent of eligible children received measles vaccination in 2025.

As the outbreak surged, hospitals filled with mostly unvaccinated or partially vaccinated infants and young children. Many cases involved babies under nine months – too young for routine vaccination – who accounted for a significant share of infections and deaths. Pneumonia emerged as the leading complication and cause of fatality.

Outbreak Origin and Rapid Nationwide Spread

The outbreak is believed to have begun in January 2026 in Rohingya refugee camps near the Myanmar border before spreading rapidly. By mid-April, Bangladesh had notified the WHO of a nationwide surge. Early tallies showed tens of thousands of suspected cases and hundreds of deaths. By September 2026, cumulative figures had climbed past 168,000-194,000 suspected cases, with nearly 20,000 laboratory-confirmed infections and more than 1,000 deaths (around 100 confirmed and over 900 suspected). Dhaka Division bore the heaviest burden.

Health authorities launched an emergency MR vaccination campaign in high-risk areas on 5 April 2026, expanding nationwide later that month. The drive targeted children aged six months to under five years and ultimately administered nearly 20 million doses – exceeding the initial target of about 18 million. Coverage was reported above 100 per cent of the original estimate in some tallies. Yet cases and deaths continued, with roughly 1,000 new suspected cases still reported daily into September.

Why Mass Vaccination Has Not Fully Halted Transmission

Experts point to several overlapping problems. National averages masked local pockets of low coverage, particularly among hard-to-reach, mobile, or low-income populations. Population estimates used for targeting may have undercounted eligible children; a concurrent Vitamin A campaign reached several million more in the same age group. Some children missed shots because they were ill on vaccination day, parents forgot the schedule, or access barriers persisted. Malnutrition and incomplete breastfeeding further increased severity risk.

A September 2026 hospital-based study of 170 children in southern Bangladesh (Chattogram) found that 56–59 per cent had prior links to hospitals or healthcare facilities, highlighting nosocomial transmission risks. Severe malnutrition raised the odds of severe disease nearly 24-fold. About 46 per cent of the children were under nine months old. All seven deaths in the study occurred among unvaccinated infants under one year who also had severe pneumonia and malnutrition. Genetic analysis identified the B3 measles genotype, a previously circulating strain with no evidence of vaccine escape.

Infants and the Limits of Routine Schedules

Infants too young for the first dose remain especially vulnerable once community transmission is intense. Hospital reviews showed the majority of deaths concentrated among children under 15 months, many under nine months, and overwhelmingly among the unvaccinated. Doctors have called for stronger infection-prevention measures in hospitals, dedicated measles wards, and better isolation protocols, noting that general paediatric wards can become amplifiers of spread.

Ongoing Response and the Path Forward

Authorities have announced intensified phases of vaccination, including door-to-door efforts and plans to reach remaining unvaccinated children starting around 26 September 2026. Some discussion continues about adjusting the routine schedule to include earlier doses in high-risk settings. Public health specialists stress the need for micro-planning to close residual gaps, sustained high routine coverage above 95 per cent in every community, catch-up for older susceptible children where indicated, and robust surveillance linked to rapid response.

The 59 per cent figure for unvaccinated suspected cases remains a stark marker of how quickly immunity gaps can turn into a public-health emergency. Bangladesh’s experience illustrates both the power of vaccination campaigns and the consequences when coverage falters over successive years. Reaching every child – especially the most vulnerable infants and those in underserved areas – will determine whether the current epidemic can finally be brought under control and whether future outbreaks can be prevented.

Focus keyphrase: Bangladesh measles outbreak unvaccinated children

Tags: measles Bangladesh, vaccination gaps, DGHS, MR vaccine, child health, outbreak 2026, unvaccinated, WHO, UNICEF, Chattogram study,