Washington: The US is facing its worst measles outbreak in more than three decades, with nearly 3,900 confirmed cases reported this year, while a massive outbreak in Pennsylvania alone has crossed 1,000 cases and caused five deaths.
New York has also declared a statewide disaster emergency after cases surged in under-immunised rural communities.
The US outbreak of measles, a highly contagious and serious airborne viral disease caused by the morbillivirus, is not an isolated problem. Across regions, measles is exploiting the same vulnerability: children who missed one or both vaccine doses during years of disrupted healthcare, weak routine immunisation, access barriers and, increasingly, vaccine hesitancy.
For a long time, most people in the United States thought of measles as something from the past. That perception is changing as cases rise again. As The Guardian reported, New York has sounded the alarm, calling the latest rash of cases a “measles disaster” as infections climb and health officials brace for what could become a significant public-health setback.
What Is Fueling The Measles Comeback?
Groups of unvaccinated people are contributing to the resurgence. Measles is one of the most contagious diseases around. If someone with measles walks into a room, the virus can remain in the air for up to two hours, and nine out of ten people in that room who are not immune will get sick.
When a neighbourhood, school or religious group has enough people who have not received their shots, it can set the stage for outbreaks.
The numbers tell only part of the story; the larger concern is how quickly herd immunity erodes when vaccination rates fall. It is also a reminder of why measles vaccination remains one of the cornerstones in battling infectious disease.
What Exactly Is Measles?
Measles is a virus that starts with a cough, fever, runny nose and red, watery eyes. People do not always realise they are contagious, and they can pass it on before they feel seriously ill.
It spreads when an infected person coughs, sneezes or breathes, releasing infectious particles into the air. According to the US Centers for Disease Control and Prevention (CDC), the virus can remain infectious in an indoor space for up to two hours after an infected person has left.
What Are The Early Symptoms Of Measles?
The signature rash associated with measles appears several days after earlier symptoms that can easily be mistaken for a cold or flu.
The first symptoms generally appear 7–14 days after infection. A few days later, small white spots known as Koplik spots can appear inside the mouth.
The characteristic measles rash generally develops around 3–5 days after the initial symptoms, beginning on the face or hairline before spreading down the body.
Children are especially at risk if they have not received the recommended MMR (measles, mumps, rubella) vaccine. Adults who cannot remember getting vaccinated or who are immunosuppressed are also vulnerable.
Bangladesh Sees Stark Warning
In Bangladesh, the warning has been particularly stark. Media reports suggest that so far this year, the country has recorded 1,134 suspected or confirmed measles deaths, while there have been over 1.75 lakh hospitalisations due to the condition since March.
Nearly four in five reported patients were children under five.
These alarming figures have prompted a targeted measles-rubella vaccination campaign, but the outbreak continues to rage.
Globally, the World Health Organisation (WHO) estimates that around 11 million people contracted measles in 2024, nearly 800,000 more than in 2019.
Only 84% of children received their first measles-containing vaccine dose and 76% received the second. This remains well short of the roughly 95% two-dose coverage needed in every community to prevent sustained transmission.
The 95% Protection Line
Measles is among the most contagious human infections. One infected person can transmit it to as many as 18 others who are susceptible.
This means even countries with relatively high national vaccination rates can experience outbreaks when unvaccinated children are concentrated in particular communities.
WHO and UNICEF say 95% coverage with two doses is needed to maintain community protection.
That is exactly what is happening in several parts of the world.
Europe and Central Asia recorded nearly 34,000 measles cases in 2025, down sharply from more than 127,000 in 2024 after outbreak-response vaccination campaigns.
However, WHO and UNICEF warned that the decline does not mean the problem has gone away. Nineteen countries in the region had continuing or re-established endemic transmission, up from 12 a year earlier.
The Americas have seen an even sharper reversal. By July 2026, more than 47,000 confirmed measles cases had been reported across the region, the highest number in 22 years.
The Pan-American Health Organisation (PAHO) has described the public-health risk as very high, citing declining vaccination, accumulated immunity gaps, population movement and vaccine hesitancy.
The US is now the most visible example.
As of October 1, the CDC had recorded 3,887 confirmed cases in 2026. Pennsylvania has accounted for more than 1,000 of them, making it the state’s biggest outbreak in more than 30 years. New York’s latest outbreak has been concentrated largely in under-immunised rural communities.
US Faces Wider Vaccine Policy Debate
The US also faces a wider debate over vaccine policy.
In June 2025, the US Department for Health and Human Services (HHS) removed all 17 members of the Centre for Disease Control and Prevention (CDC)’s Advisory Committee on Immunisation Practices, or ACIP, and replaced them with new members.
The administration said the move was intended to restore public trust. Subsequent legal challenges have questioned the appointments, while a federal court order has stayed the January 2026 revision of the childhood immunisation schedule; the CDC currently lists the July 2025 schedule as the operative one.
For infectious-disease experts, the larger concern is what happens when scientific uncertainty or political controversy becomes mixed with public messaging around vaccines.
India Has Its Own Gaps
India is not watching this from a distance. The country has made substantial progress in childhood immunisation, but coverage gaps remain large enough to create pockets where measles can take hold.
The latest National Family Health Survey (NFHS) 6 data show that coverage of the second dose of a measles-containing vaccine improved from 58.6% in NFHS-5 to 71.8%. Full immunisation among children aged 12–23 months also rose to 87.1%.
That is significant progress, given that the Universal Immunisation Programme (UIP) had taken a hit during the COVID-19 pandemic, but the second-dose figure remains below the level required to reliably prevent outbreaks.
Over the last few years, India has seen several limited measles outbreaks, including in states like Maharashtra, Gujarat and Delhi and, more recently, in Madhya Pradesh, where 31 child deaths in just a few villages were recorded, with measles, along with other factors, listed as possible causes.
According to experts, the priority should therefore be to find zero-dose and missing children, close the second-dose gap, strengthen surveillance and work with local communities.
